Explore the YouTubeAudio-macOS project to understand the current audio architecture for the DJ mixer. Focus on:

1. The AudioMixerService.swift - how AVAudioEngine is configured
2. What audio nodes are already in use (players, mixers, time pitch)
3. How the audio graph is connected
4. The DeckState model and what properties it tracks
5. The DeckView and MixerView to understand the current UI

Search in /Users/neog/Apps/macOS/YouTubeAudio-macOS/

I need to understand the current implementation to plan adding EQ (low/mid/high) controls like a real DJ mixer.


I'll explore the YouTubeAudio-macOS project to understand the current audio architecture. Let me search for the key files you mentioned.


Bash

find "/Users/neog/Apps/macOS/YouTubeAudio-macOS" -type f -name "*.swift" | head -20

List Swift files in the project


Now let me read the key files to understand the architecture:


     1→import AVFoundation
     2→import Combine
     3→
     4→@MainActor
     5→class AudioMixerService: ObservableObject {
     6→    // MARK: - Published State
     7→    @Published var deckA = DeckState(id: "A")
     8→    @Published var deckB = DeckState(id: "B")
     9→    @Published var crossfaderPosition: Float = 0.5  // 0.0 = Deck A, 1.0 = Deck B
    10→    @Published var masterVolume: Float = 1.0
    11→    @Published var isEngineRunning = false
    12→
    13→    // MARK: - Audio Engine
    14→    private let audioEngine = AVAudioEngine()
    15→
    16→    // Deck A nodes
    17→    private let playerNodeA = AVAudioPlayerNode()
    18→    private let timePitchA = AVAudioUnitTimePitch()
    19→    private let mixerNodeA = AVAudioMixerNode()
    20→
    21→    // Deck B nodes
    22→    private let playerNodeB = AVAudioPlayerNode()
    23→    private let timePitchB = AVAudioUnitTimePitch()
    24→    private let mixerNodeB = AVAudioMixerNode()
    25→
    26→    // Audio files
    27→    private var audioFileA: AVAudioFile?
    28→    private var audioFileB: AVAudioFile?
    29→
    30→    // Tracking
    31→    private var positionTimer: Timer?
    32→    private var cancellables = Set<AnyCancellable>()
    33→
    34→    // BPM Service
    35→    private let bpmService = BPMDetectionService()
    36→
    37→    // MARK: - Initialization
    38→
    39→    init() {
    40→        setupAudioEngine()
    41→        setupCrossfaderBinding()
    42→    }
    43→
    44→    private func setupAudioEngine() {
    45→        // Attach all nodes
    46→        audioEngine.attach(playerNodeA)
    47→        audioEngine.attach(timePitchA)
    48→        audioEngine.attach(mixerNodeA)
    49→
    50→        audioEngine.attach(playerNodeB)
    51→        audioEngine.attach(timePitchB)
    52→        audioEngine.attach(mixerNodeB)
    53→
    54→        // Connect Deck A chain: Player -> TimePitch -> Mixer -> MainMixer
    55→        audioEngine.connect(playerNodeA, to: timePitchA, format: nil)
    56→        audioEngine.connect(timePitchA, to: mixerNodeA, format: nil)
    57→        audioEngine.connect(mixerNodeA, to: audioEngine.mainMixerNode, format: nil)
    58→
    59→        // Connect Deck B chain: Player -> TimePitch -> Mixer -> MainMixer
    60→        audioEngine.connect(playerNodeB, to: timePitchB, format: nil)
    61→        audioEngine.connect(timePitchB, to: mixerNodeB, format: nil)
    62→        audioEngine.connect(mixerNodeB, to: audioEngine.mainMixerNode, format: nil)
    63→
    64→        // Prepare engine
    65→        audioEngine.prepare()
    66→    }
    67→
    68→    private func setupCrossfaderBinding() {
    69→        $crossfaderPosition
    70→            .sink { [weak self] position in
    71→                self?.applyCrossfade(position: position)
    72→            }
    73→            .store(in: &cancellables)
    74→    }
    75→
    76→    // MARK: - Engine Control
    77→
    78→    func startEngine() throws {
    79→        guard !audioEngine.isRunning else { return }
    80→        try audioEngine.start()
    81→        isEngineRunning = true
    82→        startPositionUpdates()
    83→    }
    84→
    85→    func stopEngine() {
    86→        audioEngine.stop()
    87→        isEngineRunning = false
    88→        stopPositionUpdates()
    89→    }
    90→
    91→    // MARK: - Load Audio
    92→
    93→    func loadAudio(_ audio: DownloadedAudio, toDeck deck: String) async throws {
    94→        guard let url = FileStorageService.shared.getAudioURL(for: audio) else {
    95→            throw MixerError.fileNotFound
    96→        }
    97→
    98→        let audioFile = try AVAudioFile(forReading: url)
    99→        let format = audioFile.processingFormat
   100→        let duration = Double(audioFile.length) / audioFile.fileFormat.sampleRate
   101→
   102→        // Detect BPM in background
   103→        let detectedBPM = try? await bpmService.analyzeBPM(url: url)
   104→
   105→        await MainActor.run {
   106→            if deck == "A" {
   107→                if deckA.isPlaying {
   108→                    playerNodeA.stop()
   109→                }
   110→
   111→                audioFileA = audioFile
   112→                deckA.audio = audio
   113→                deckA.duration = duration
   114→                deckA.currentTime = 0
   115→                deckA.isLoaded = true
   116→                deckA.isPlaying = false
   117→                deckA.bpm = detectedBPM
   118→
   119→                // Reconnect with proper format
   120→                audioEngine.disconnectNodeOutput(playerNodeA)
   121→                audioEngine.connect(playerNodeA, to: timePitchA, format: format)
   122→
   123→                // Schedule file
   124→                playerNodeA.scheduleFile(audioFile, at: nil)
   125→            } else {
   126→                if deckB.isPlaying {
   127→                    playerNodeB.stop()
   128→                }
   129→
   130→                audioFileB = audioFile
   131→                deckB.audio = audio
   132→                deckB.duration = duration
   133→                deckB.currentTime = 0
   134→                deckB.isLoaded = true
   135→                deckB.isPlaying = false
   136→                deckB.bpm = detectedBPM
   137→
   138→                audioEngine.disconnectNodeOutput(playerNodeB)
   139→                audioEngine.connect(playerNodeB, to: timePitchB, format: format)
   140→
   141→                playerNodeB.scheduleFile(audioFile, at: nil)
   142→            }
   143→        }
   144→    }
   145→
   146→    // MARK: - Playback Control
   147→
   148→    func play(deck: String) throws {
   149→        if !audioEngine.isRunning {
   150→            try startEngine()
   151→        }
   152→
   153→        if deck == "A" {
   154→            guard deckA.isLoaded else { return }
   155→            playerNodeA.play()
   156→            deckA.isPlaying = true
   157→        } else {
   158→            guard deckB.isLoaded else { return }
   159→            playerNodeB.play()
   160→            deckB.isPlaying = true
   161→        }
   162→    }
   163→
   164→    func pause(deck: String) {
   165→        if deck == "A" {
   166→            playerNodeA.pause()
   167→            deckA.isPlaying = false
   168→        } else {
   169→            playerNodeB.pause()
   170→            deckB.isPlaying = false
   171→        }
   172→    }
   173→
   174→    func stop(deck: String) {
   175→        if deck == "A" {
   176→            playerNodeA.stop()
   177→            deckA.isPlaying = false
   178→            deckA.currentTime = 0
   179→            if let file = audioFileA {
   180→                playerNodeA.scheduleFile(file, at: nil)
   181→            }
   182→        } else {
   183→            playerNodeB.stop()
   184→            deckB.isPlaying = false
   185→            deckB.currentTime = 0
   186→            if let file = audioFileB {
   187→                playerNodeB.scheduleFile(file, at: nil)
   188→            }
   189→        }
   190→    }
   191→
   192→    func seek(deck: String, to time: TimeInterval) {
   193→        let player = deck == "A" ? playerNodeA : playerNodeB
   194→        let file = deck == "A" ? audioFileA : audioFileB
   195→        let wasPlaying = deck == "A" ? deckA.isPlaying : deckB.isPlaying
   196→
   197→        guard let audioFile = file else { return }
   198→
   199→        player.stop()
   200→
   201→        let sampleRate = audioFile.processingFormat.sampleRate
   202→        let startFrame = AVAudioFramePosition(time * sampleRate)
   203→        let totalFrames = audioFile.length
   204→        let frameCount = AVAudioFrameCount(totalFrames - startFrame)
   205→
   206→        guard frameCount > 0, startFrame < totalFrames else { return }
   207→
   208→        player.scheduleSegment(
   209→            audioFile,
   210→            startingFrame: startFrame,
   211→            frameCount: frameCount,
   212→            at: nil
   213→        )
   214→
   215→        if deck == "A" {
   216→            deckA.currentTime = time
   217→        } else {
   218→            deckB.currentTime = time
   219→        }
   220→
   221→        if wasPlaying {
   222→            player.play()
   223→        }
   224→    }
   225→
   226→    // MARK: - Cue Points
   227→
   228→    func setCuePoint(deck: String) {
   229→        if deck == "A" {
   230→            deckA.cuePoint = deckA.currentTime
   231→        } else {
   232→            deckB.cuePoint = deckB.currentTime
   233→        }
   234→    }
   235→
   236→    func jumpToCue(deck: String) {
   237→        let cuePoint = deck == "A" ? deckA.cuePoint : deckB.cuePoint
   238→        guard let cue = cuePoint else { return }
   239→        seek(deck: deck, to: cue)
   240→    }
   241→
   242→    // MARK: - Tempo & Pitch Control
   243→
   244→    func setTempo(deck: String, rate: Float) {
   245→        let clampedRate = max(0.5, min(2.0, rate))
   246→        if deck == "A" {
   247→            timePitchA.rate = clampedRate
   248→            deckA.tempo = clampedRate
   249→        } else {
   250→            timePitchB.rate = clampedRate
   251→            deckB.tempo = clampedRate
   252→        }
   253→    }
   254→
   255→    func setPitch(deck: String, cents: Float) {
   256→        let clampedCents = max(-1200, min(1200, cents))
   257→        if deck == "A" {
   258→            timePitchA.pitch = clampedCents
   259→            deckA.pitch = clampedCents
   260→        } else {
   261→            timePitchB.pitch = clampedCents
   262→            deckB.pitch = clampedCents
   263→        }
   264→    }
   265→
   266→    // MARK: - Crossfade
   267→
   268→    private func applyCrossfade(position: Float) {
   269→        // Equal power crossfade curve for smooth transitions
   270→        let volumeA = sqrt(1.0 - position) * masterVolume
   271→        let volumeB = sqrt(position) * masterVolume
   272→
   273→        mixerNodeA.outputVolume = volumeA
   274→        mixerNodeB.outputVolume = volumeB
   275→    }
   276→
   277→    func setVolume(deck: String, volume: Float) {
   278→        let clamped = max(0, min(1, volume))
   279→        if deck == "A" {
   280→            deckA.volume = clamped
   281→        } else {
   282→            deckB.volume = clamped
   283→        }
   284→        applyCrossfade(position: crossfaderPosition)
   285→    }
   286→
   287→    // MARK: - Auto Crossfade
   288→
   289→    func autoCrossfade(duration: TimeInterval, toDeck: String) {
   290→        let targetPosition: Float = toDeck == "A" ? 0.0 : 1.0
   291→        let startPosition = crossfaderPosition
   292→        let startTime = CACurrentMediaTime()
   293→
   294→        Timer.scheduledTimer(withTimeInterval: 1.0/60.0, repeats: true) { [weak self] timer in
   295→            guard let self = self else {
   296→                timer.invalidate()
   297→                return
   298→            }
   299→
   300→            let elapsed = CACurrentMediaTime() - startTime
   301→            let progress = min(Float(elapsed / duration), 1.0)
   302→
   303→            Task { @MainActor in
   304→                self.crossfaderPosition = startPosition + (targetPosition - startPosition) * progress
   305→
   306→                if progress >= 1.0 {
   307→                    timer.invalidate()
   308→                }
   309→            }
   310→        }
   311→    }
   312→
   313→    // MARK: - Position Updates
   314→
   315→    private func startPositionUpdates() {
   316→        positionTimer = Timer.scheduledTimer(withTimeInterval: 1.0/30.0, repeats: true) { [weak self] _ in
   317→            Task { @MainActor in
   318→                self?.updatePlaybackPositions()
   319→            }
   320→        }
   321→    }
   322→
   323→    private func stopPositionUpdates() {
   324→        positionTimer?.invalidate()
   325→        positionTimer = nil
   326→    }
   327→
   328→    private func updatePlaybackPositions() {
   329→        if deckA.isPlaying, let nodeTime = playerNodeA.lastRenderTime,
   330→           let playerTime = playerNodeA.playerTime(forNodeTime: nodeTime) {
   331→            let sampleRate = playerTime.sampleRate
   332→            deckA.currentTime = Double(playerTime.sampleTime) / sampleRate
   333→        }
   334→
   335→        if deckB.isPlaying, let nodeTime = playerNodeB.lastRenderTime,
   336→           let playerTime = playerNodeB.playerTime(forNodeTime: nodeTime) {
   337→            let sampleRate = playerTime.sampleRate
   338→            deckB.currentTime = Double(playerTime.sampleTime) / sampleRate
   339→        }
   340→    }
   341→
   342→    // MARK: - Cleanup
   343→
   344→    func unloadDeck(_ deck: String) {
   345→        if deck == "A" {
   346→            playerNodeA.stop()
   347→            audioFileA = nil
   348→            deckA = DeckState(id: "A")
   349→        } else {
   350→            playerNodeB.stop()
   351→            audioFileB = nil
   352→            deckB = DeckState(id: "B")
   353→        }
   354→    }
   355→}
   356→
   357→// MARK: - Errors
   358→
   359→enum MixerError: LocalizedError {
   360→    case fileNotFound
   361→    case engineStartFailed
   362→    case formatMismatch
   363→
   364→    var errorDescription: String? {
   365→        switch self {
   366→        case .fileNotFound: return "Audio file not found"
   367→        case .engineStartFailed: return "Failed to start audio engine"
   368→        case .formatMismatch: return "Audio format not compatible"
   369→        }
   370→    }
   371→}
   372→

<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>

import AVFoundation
import Combine

@MainActor
class AudioMixerService: ObservableObject {
    // MARK: - Published State
    @Published var deckA = DeckState(id: "A")
    @Published var deckB = DeckState(id: "B")
    @Published var crossfaderPosition: Float = 0.5  // 0.0 = Deck A, 1.0 = Deck B
    @Published var masterVolume: Float = 1.0
    @Published var isEngineRunning = false

    // MARK: - Audio Engine
    private let audioEngine = AVAudioEngine()

    // Deck A nodes
    private let playerNodeA = AVAudioPlayerNode()
    private let timePitchA = AVAudioUnitTimePitch()
    private let mixerNodeA = AVAudioMixerNode()

    // Deck B nodes
    private let playerNodeB = AVAudioPlayerNode()
    private let timePitchB = AVAudioUnitTimePitch()
    private let mixerNodeB = AVAudioMixerNode()

    // Audio files
    private var audioFileA: AVAudioFile?
    private var audioFileB: AVAudioFile?

    // Tracking
    private var positionTimer: Timer?
    private var cancellables = Set<AnyCancellable>()

    // BPM Service
    private let bpmService = BPMDetectionService()

    // MARK: - Initialization

    init() {
        setupAudioEngine()
        setupCrossfaderBinding()
    }

    private func setupAudioEngine() {
        // Attach all nodes
        audioEngine.attach(playerNodeA)
        audioEngine.attach(timePitchA)
        audioEngine.attach(mixerNodeA)

        audioEngine.attach(playerNodeB)
        audioEngine.attach(timePitchB)
        audioEngine.attach(mixerNodeB)

        // Connect Deck A chain: Player -> TimePitch -> Mixer -> MainMixer
        audioEngine.connect(playerNodeA, to: timePitchA, format: nil)
        audioEngine.connect(timePitchA, to: mixerNodeA, format: nil)
        audioEngine.connect(mixerNodeA, to: audioEngine.mainMixerNode, format: nil)

        // Connect Deck B chain: Player -> TimePitch -> Mixer -> MainMixer
        audioEngine.connect(playerNodeB, to: timePitchB, format: nil)
        audioEngine.connect(timePitchB, to: mixerNodeB, format: nil)
        audioEngine.connect(mixerNodeB, to: audioEngine.mainMixerNode, format: nil)

        // Prepare engine
        audioEngine.prepare()
    }

    private func setupCrossfaderBinding() {
        $crossfaderPosition
            .sink { [weak self] position in
                self?.applyCrossfade(position: position)
            }
            .store(in: &cancellables)
    }

    // MARK: - Engine Control

    func startEngine() throws {
        guard !audioEngine.isRunning else { return }
        try audioEngine.start()
        isEngineRunning = true
        startPositionUpdates()
    }

    func stopEngine() {
        audioEngine.stop()
        isEngineRunning = false
        stopPositionUpdates()
    }

    // MARK: - Load Audio

    func loadAudio(_ audio: DownloadedAudio, toDeck deck: String) async throws {
        guard let url = FileStorageService.shared.getAudioURL(for: audio) else {
            throw MixerError.fileNotFound
        }

        let audioFile = try AVAudioFile(forReading: url)
        let format = audioFile.processingFormat
        let duration = Double(audioFile.length) / audioFile.fileFormat.sampleRate

        // Detect BPM in background
        let detectedBPM = try? await bpmService.analyzeBPM(url: url)

        await MainActor.run {
            if deck == "A" {
                if deckA.isPlaying {
                    playerNodeA.stop()
                }

                audioFileA = audioFile
                deckA.audio = audio
                deckA.duration = duration
                deckA.currentTime = 0
                deckA.isLoaded = true
                deckA.isPlaying = false
                deckA.bpm = detectedBPM

                // Reconnect with proper format
                audioEngine.disconnectNodeOutput(playerNodeA)
                audioEngine.connect(playerNodeA, to: timePitchA, format: format)

                // Schedule file
                playerNodeA.scheduleFile(audioFile, at: nil)
            } else {
                if deckB.isPlaying {
                    playerNodeB.stop()
                }

                audioFileB = audioFile
                deckB.audio = audio
                deckB.duration = duration
                deckB.currentTime = 0
                deckB.isLoaded = true
                deckB.isPlaying = false
                deckB.bpm = detectedBPM

                audioEngine.disconnectNodeOutput(playerNodeB)
                audioEngine.connect(playerNodeB, to: timePitchB, format: format)

                playerNodeB.scheduleFile(audioFile, at: nil)
            }
        }
    }

    // MARK: - Playback Control

    func play(deck: String) throws {
        if !audioEngine.isRunning {
            try startEngine()
        }

        if deck == "A" {
            guard deckA.isLoaded else { return }
            playerNodeA.play()
            deckA.isPlaying = true
        } else {
            guard deckB.isLoaded else { return }
            playerNodeB.play()
            deckB.isPlaying = true
        }
    }

    func pause(deck: String) {
        if deck == "A" {
            playerNodeA.pause()
            deckA.isPlaying = false
        } else {
            playerNodeB.pause()
            deckB.isPlaying = false
        }
    }

    func stop(deck: String) {
        if deck == "A" {
            playerNodeA.stop()
            deckA.isPlaying = false
            deckA.currentTime = 0
            if let file = audioFileA {
                playerNodeA.scheduleFile(file, at: nil)
            }
        } else {
            playerNodeB.stop()
            deckB.isPlaying = false
            deckB.currentTime = 0
            if let file = audioFileB {
                playerNodeB.scheduleFile(file, at: nil)
            }
        }
    }

    func seek(deck: String, to time: TimeInterval) {
        let player = deck == "A" ? playerNodeA : playerNodeB
        let file = deck == "A" ? audioFileA : audioFileB
        let wasPlaying = deck == "A" ? deckA.isPlaying : deckB.isPlaying

        guard let audioFile = file else { return }

        player.stop()

        let sampleRate = audioFile.processingFormat.sampleRate
        let startFrame = AVAudioFramePosition(time * sampleRate)
        let totalFrames = audioFile.length
        let frameCount = AVAudioFrameCount(totalFrames - startFrame)

        guard frameCount > 0, startFrame < totalFrames else { return }

        player.scheduleSegment(
            audioFile,
            startingFrame: startFrame,
            frameCount: frameCount,
            at: nil
        )

        if deck == "A" {
            deckA.currentTime = time
        } else {
            deckB.currentTime = time
        }

        if wasPlaying {
            player.play()
        }
    }

    // MARK: - Cue Points

    func setCuePoint(deck: String) {
        if deck == "A" {
            deckA.cuePoint = deckA.currentTime
        } else {
            deckB.cuePoint = deckB.currentTime
        }
    }

    func jumpToCue(deck: String) {
        let cuePoint = deck == "A" ? deckA.cuePoint : deckB.cuePoint
        guard let cue = cuePoint else { return }
        seek(deck: deck, to: cue)
    }

    // MARK: - Tempo & Pitch Control

    func setTempo(deck: String, rate: Float) {
        let clampedRate = max(0.5, min(2.0, rate))
        if deck == "A" {
            timePitchA.rate = clampedRate
            deckA.tempo = clampedRate
        } else {
            timePitchB.rate = clampedRate
            deckB.tempo = clampedRate
        }
    }

    func setPitch(deck: String, cents: Float) {
        let clampedCents = max(-1200, min(1200, cents))
        if deck == "A" {
            timePitchA.pitch = clampedCents
            deckA.pitch = clampedCents
        } else {
            timePitchB.pitch = clampedCents
            deckB.pitch = clampedCents
        }
    }

    // MARK: - Crossfade

    private func applyCrossfade(position: Float) {
        // Equal power crossfade curve for smooth transitions
        let volumeA = sqrt(1.0 - position) * masterVolume
        let volumeB = sqrt(position) * masterVolume

        mixerNodeA.outputVolume = volumeA
        mixerNodeB.outputVolume = volumeB
    }

    func setVolume(deck: String, volume: Float) {
        let clamped = max(0, min(1, volume))
        if deck == "A" {
            deckA.volume = clamped
        } else {
            deckB.volume = clamped
        }
        applyCrossfade(position: crossfaderPosition)
    }

    // MARK: - Auto Crossfade

    func autoCrossfade(duration: TimeInterval, toDeck: String) {
        let targetPosition: Float = toDeck == "A" ? 0.0 : 1.0
        let startPosition = crossfaderPosition
        let startTime = CACurrentMediaTime()

        Timer.scheduledTimer(withTimeInterval: 1.0/60.0, repeats: true) { [weak self] timer in
            guard let self = self else {
                timer.invalidate()
                return
            }

            let elapsed = CACurrentMediaTime() - startTime
            let progress = min(Float(elapsed / duration), 1.0)

            Task { @MainActor in
                self.crossfaderPosition = startPosition + (targetPosition - startPosition) * progress

                if progress >= 1.0 {
                    timer.invalidate()
                }
            }
        }
    }

    // MARK: - Position Updates

    private func startPositionUpdates() {
        positionTimer = Timer.scheduledTimer(withTimeInterval: 1.0/30.0, repeats: true) { [weak self] _ in
            Task { @MainActor in
                self?.updatePlaybackPositions()
            }
        }
    }

    private func stopPositionUpdates() {
        positionTimer?.invalidate()
        positionTimer = nil
    }

    private func updatePlaybackPositions() {
        if deckA.isPlaying, let nodeTime = playerNodeA.lastRenderTime,
           let playerTime = playerNodeA.playerTime(forNodeTime: nodeTime) {
            let sampleRate = playerTime.sampleRate
            deckA.currentTime = Double(playerTime.sampleTime) / sampleRate
        }

        if deckB.isPlaying, let nodeTime = playerNodeB.lastRenderTime,
           let playerTime = playerNodeB.playerTime(forNodeTime: nodeTime) {
            let sampleRate = playerTime.sampleRate
            deckB.currentTime = Double(playerTime.sampleTime) / sampleRate
        }
    }

    // MARK: - Cleanup

    func unloadDeck(_ deck: String) {
        if deck == "A" {
            playerNodeA.stop()
            audioFileA = nil
            deckA = DeckState(id: "A")
        } else {
            playerNodeB.stop()
            audioFileB = nil
            deckB = DeckState(id: "B")
        }
    }
}

// MARK: - Errors

enum MixerError: LocalizedError {
    case fileNotFound
    case engineStartFailed
    case formatMismatch

    var errorDescription: String? {
        switch self {
        case .fileNotFound: return "Audio file not found"
        case .engineStartFailed: return "Failed to start audio engine"
        case .formatMismatch: return "Audio format not compatible"
        }
    }
}


     1→import Foundation
     2→
     3→struct DeckState: Identifiable {
     4→    let id: String  // "A" or "B"
     5→    var audio: DownloadedAudio?
     6→    var isPlaying: Bool = false
     7→    var isLoaded: Bool = false
     8→    var currentTime: TimeInterval = 0
     9→    var duration: TimeInterval = 0
    10→    var volume: Float = 1.0       // 0.0 - 1.0
    11→    var tempo: Float = 1.0        // 0.5 - 2.0 (playback rate)
    12→    var pitch: Float = 0          // -2400 to +2400 cents
    13→    var bpm: Double?              // Detected BPM
    14→    var cuePoint: TimeInterval?   // Saved cue position
    15→
    16→    var progress: Double {
    17→        guard duration > 0 else { return 0 }
    18→        return currentTime / duration
    19→    }
    20→
    21→    var formattedCurrentTime: String {
    22→        formatTime(currentTime)
    23→    }
    24→
    25→    var formattedDuration: String {
    26→        formatTime(duration)
    27→    }
    28→
    29→    var tempoPercentage: Int {
    30→        Int((tempo - 1.0) * 100)
    31→    }
    32→
    33→    var pitchSemitones: Int {
    34→        Int(pitch / 100)
    35→    }
    36→
    37→    private func formatTime(_ time: TimeInterval) -> String {
    38→        let minutes = Int(time) / 60
    39→        let seconds = Int(time) % 60
    40→        return String(format: "%d:%02d", minutes, seconds)
    41→    }
    42→}
    43→

<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>

import Foundation

struct DeckState: Identifiable {
    let id: String  // "A" or "B"
    var audio: DownloadedAudio?
    var isPlaying: Bool = false
    var isLoaded: Bool = false
    var currentTime: TimeInterval = 0
    var duration: TimeInterval = 0
    var volume: Float = 1.0       // 0.0 - 1.0
    var tempo: Float = 1.0        // 0.5 - 2.0 (playback rate)
    var pitch: Float = 0          // -2400 to +2400 cents
    var bpm: Double?              // Detected BPM
    var cuePoint: TimeInterval?   // Saved cue position

    var progress: Double {
        guard duration > 0 else { return 0 }
        return currentTime / duration
    }

    var formattedCurrentTime: String {
        formatTime(currentTime)
    }

    var formattedDuration: String {
        formatTime(duration)
    }

    var tempoPercentage: Int {
        Int((tempo - 1.0) * 100)
    }

    var pitchSemitones: Int {
        Int(pitch / 100)
    }

    private func formatTime(_ time: TimeInterval) -> String {
        let minutes = Int(time) / 60
        let seconds = Int(time) % 60
        return String(format: "%d:%02d", minutes, seconds)
    }
}


     1→import SwiftUI
     2→import UniformTypeIdentifiers
     3→
     4→struct DeckView: View {
     5→    let deck: DeckState
     6→    let deckId: String
     7→    @ObservedObject var mixerService: AudioMixerService
     8→    let onLoadTrack: () -> Void
     9→    var onDropAudio: ((DownloadedAudio) -> Void)?
    10→
    11→    @State private var isDropTargeted = false
    12→
    13→    var deckColor: Color {
    14→        deckId == "A" ? .blue : .orange
    15→    }
    16→
    17→    var body: some View {
    18→        VStack(spacing: 16) {
    19→            // Deck header
    20→            HStack {
    21→                Text("DECK \(deckId)")
    22→                    .font(.headline.bold())
    23→                    .foregroundStyle(deckColor)
    24→
    25→                Spacer()
    26→
    27→                if let bpm = deck.bpm {
    28→                    HStack(spacing: 4) {
    29→                        Image(systemName: "metronome")
    30→                            .font(.caption)
    31→                        Text("\(bpm, specifier: "%.1f") BPM")
    32→                            .font(.system(.caption, design: .monospaced))
    33→                    }
    34→                    .padding(.horizontal, 10)
    35→                    .padding(.vertical, 5)
    36→                    .background(deckColor.opacity(0.2))
    37→                    .clipShape(Capsule())
    38→                }
    39→            }
    40→
    41→            // Track info or load button
    42→            if let audio = deck.audio {
    43→                VStack(alignment: .leading, spacing: 4) {
    44→                    Text(audio.title)
    45→                        .font(.subheadline.bold())
    46→                        .lineLimit(2)
    47→
    48→                    HStack {
    49→                        Text(audio.formattedDuration)
    50→                            .font(.caption)
    51→                            .foregroundStyle(.secondary)
    52→
    53→                        Spacer()
    54→
    55→                        Button {
    56→                            mixerService.unloadDeck(deckId)
    57→                        } label: {
    58→                            Image(systemName: "xmark.circle.fill")
    59→                                .foregroundStyle(.secondary)
    60→                        }
    61→                        .buttonStyle(.plain)
    62→                    }
    63→                }
    64→                .frame(maxWidth: .infinity, alignment: .leading)
    65→                .padding()
    66→                .background(Color.gray.opacity(0.1))
    67→                .clipShape(RoundedRectangle(cornerRadius: 8))
    68→            } else {
    69→                Button(action: onLoadTrack) {
    70→                    VStack(spacing: 8) {
    71→                        Image(systemName: "plus.circle.fill")
    72→                            .font(.largeTitle)
    73→                        Text("Load Track")
    74→                            .font(.subheadline)
    75→                    }
    76→                    .frame(maxWidth: .infinity)
    77→                    .frame(height: 80)
    78→                    .background(Color.gray.opacity(0.1))
    79→                    .clipShape(RoundedRectangle(cornerRadius: 8))
    80→                }
    81→                .buttonStyle(.plain)
    82→            }
    83→
    84→            // Waveform
    85→            if deck.isLoaded {
    86→                WaveformView(progress: deck.progress, color: deckColor)
    87→                    .frame(height: 60)
    88→            } else {
    89→                Rectangle()
    90→                    .fill(Color.gray.opacity(0.1))
    91→                    .frame(height: 60)
    92→                    .clipShape(RoundedRectangle(cornerRadius: 4))
    93→            }
    94→
    95→            // Time display
    96→            HStack {
    97→                Text(deck.formattedCurrentTime)
    98→                    .font(.system(.caption, design: .monospaced))
    99→                Spacer()
   100→                Text(deck.formattedDuration)
   101→                    .font(.system(.caption, design: .monospaced))
   102→                    .foregroundStyle(.secondary)
   103→            }
   104→
   105→            // Progress slider
   106→            Slider(
   107→                value: Binding(
   108→                    get: { deck.progress },
   109→                    set: { mixerService.seek(deck: deckId, to: $0 * deck.duration) }
   110→                )
   111→            )
   112→            .disabled(!deck.isLoaded)
   113→            .tint(deckColor)
   114→
   115→            // Transport controls
   116→            HStack(spacing: 24) {
   117→                // Cue button
   118→                Button {
   119→                    if deck.cuePoint == nil {
   120→                        mixerService.setCuePoint(deck: deckId)
   121→                    } else {
   122→                        mixerService.jumpToCue(deck: deckId)
   123→                    }
   124→                } label: {
   125→                    VStack(spacing: 2) {
   126→                        Image(systemName: deck.cuePoint != nil ? "bookmark.fill" : "bookmark")
   127→                            .font(.title2)
   128→                        Text("CUE")
   129→                            .font(.caption2)
   130→                    }
   131→                    .frame(width: 50)
   132→                }
   133→                .buttonStyle(.plain)
   134→                .foregroundStyle(deck.cuePoint != nil ? deckColor : .primary)
   135→                .disabled(!deck.isLoaded)
   136→
   137→                // Stop
   138→                Button {
   139→                    mixerService.stop(deck: deckId)
   140→                } label: {
   141→                    VStack(spacing: 2) {
   142→                        Image(systemName: "stop.fill")
   143→                            .font(.title2)
   144→                        Text("STOP")
   145→                            .font(.caption2)
   146→                    }
   147→                    .frame(width: 50)
   148→                }
   149→                .buttonStyle(.plain)
   150→                .disabled(!deck.isLoaded)
   151→
   152→                // Play/Pause
   153→                Button {
   154→                    if deck.isPlaying {
   155→                        mixerService.pause(deck: deckId)
   156→                    } else {
   157→                        try? mixerService.play(deck: deckId)
   158→                    }
   159→                } label: {
   160→                    VStack(spacing: 2) {
   161→                        Image(systemName: deck.isPlaying ? "pause.circle.fill" : "play.circle.fill")
   162→                            .font(.system(size: 40))
   163→                        Text(deck.isPlaying ? "PAUSE" : "PLAY")
   164→                            .font(.caption2)
   165→                    }
   166→                    .frame(width: 60)
   167→                }
   168→                .buttonStyle(.plain)
   169→                .foregroundStyle(deck.isPlaying ? deckColor : .primary)
   170→                .disabled(!deck.isLoaded)
   171→            }
   172→
   173→            Divider()
   174→                .padding(.vertical, 8)
   175→
   176→            // Tempo control
   177→            VStack(spacing: 8) {
   178→                HStack {
   179→                    Text("TEMPO")
   180→                        .font(.caption.bold())
   181→                        .foregroundStyle(.secondary)
   182→                    Spacer()
   183→                    Text("\(deck.tempoPercentage >= 0 ? "+" : "")\(deck.tempoPercentage)%")
   184→                        .font(.system(.caption, design: .monospaced))
   185→                        .foregroundStyle(deck.tempo != 1.0 ? deckColor : .primary)
   186→                }
   187→
   188→                HStack {
   189→                    Text("-50%")
   190→                        .font(.caption2)
   191→                        .foregroundStyle(.secondary)
   192→
   193→                    Slider(
   194→                        value: Binding(
   195→                            get: { deck.tempo },
   196→                            set: { mixerService.setTempo(deck: deckId, rate: $0) }
   197→                        ),
   198→                        in: 0.5...2.0
   199→                    )
   200→                    .tint(deckColor)
   201→
   202→                    Text("+100%")
   203→                        .font(.caption2)
   204→                        .foregroundStyle(.secondary)
   205→                }
   206→
   207→                Button("Reset") {
   208→                    mixerService.setTempo(deck: deckId, rate: 1.0)
   209→                }
   210→                .font(.caption)
   211→                .buttonStyle(.bordered)
   212→                .controlSize(.small)
   213→            }
   214→
   215→            // Pitch control
   216→            VStack(spacing: 8) {
   217→                HStack {
   218→                    Text("PITCH")
   219→                        .font(.caption.bold())
   220→                        .foregroundStyle(.secondary)
   221→                    Spacer()
   222→                    Text("\(deck.pitchSemitones >= 0 ? "+" : "")\(deck.pitchSemitones) st")
   223→                        .font(.system(.caption, design: .monospaced))
   224→                        .foregroundStyle(deck.pitch != 0 ? deckColor : .primary)
   225→                }
   226→
   227→                HStack {
   228→                    Text("-12")
   229→                        .font(.caption2)
   230→                        .foregroundStyle(.secondary)
   231→
   232→                    Slider(
   233→                        value: Binding(
   234→                            get: { deck.pitch },
   235→                            set: { mixerService.setPitch(deck: deckId, cents: $0) }
   236→                        ),
   237→                        in: -1200...1200
   238→                    )
   239→                    .tint(deckColor)
   240→
   241→                    Text("+12")
   242→                        .font(.caption2)
   243→                        .foregroundStyle(.secondary)
   244→                }
   245→
   246→                Button("Reset") {
   247→                    mixerService.setPitch(deck: deckId, cents: 0)
   248→                }
   249→                .font(.caption)
   250→                .buttonStyle(.bordered)
   251→                .controlSize(.small)
   252→            }
   253→        }
   254→        .padding()
   255→        .background(Color(NSColor.controlBackgroundColor))
   256→        .clipShape(RoundedRectangle(cornerRadius: 12))
   257→        .frame(minWidth: 350)
   258→        .overlay {
   259→            if isDropTargeted {
   260→                RoundedRectangle(cornerRadius: 12)
   261→                    .strokeBorder(deckColor, lineWidth: 3)
   262→                    .background(deckColor.opacity(0.1).clipShape(RoundedRectangle(cornerRadius: 12)))
   263→                    .overlay {
   264→                        VStack(spacing: 8) {
   265→                            Image(systemName: "arrow.down.circle.fill")
   266→                                .font(.system(size: 48))
   267→                            Text("Drop to Load")
   268→                                .font(.headline)
   269→                        }
   270→                        .foregroundStyle(deckColor)
   271→                    }
   272→            }
   273→        }
   274→        .dropDestination(for: URL.self) { urls, _ in
   275→            guard let url = urls.first else { return false }
   276→            // Handle dropped audio file URL
   277→            return handleDroppedURL(url)
   278→        } isTargeted: { targeted in
   279→            withAnimation(.easeInOut(duration: 0.15)) {
   280→                isDropTargeted = targeted
   281→            }
   282→        }
   283→    }
   284→
   285→    private func handleDroppedURL(_ url: URL) -> Bool {
   286→        let supportedExtensions = ["mp3", "m4a", "mp4", "wav", "aac", "flac"]
   287→        guard supportedExtensions.contains(url.pathExtension.lowercased()) else {
   288→            return false
   289→        }
   290→
   291→        // Create a temporary DownloadedAudio from the file
   292→        let filename = url.lastPathComponent
   293→        let title = url.deletingPathExtension().lastPathComponent
   294→
   295→        let audio = DownloadedAudio(
   296→            title: title,
   297→            videoId: "local-\(UUID().uuidString.prefix(8))",
   298→            duration: 0,
   299→            filename: filename,
   300→            thumbnailURL: nil
   301→        )
   302→
   303→        onDropAudio?(audio)
   304→        return true
   305→    }
   306→}
   307→
   308→#Preview {
   309→    HStack {
   310→        DeckView(
   311→            deck: DeckState(id: "A"),
   312→            deckId: "A",
   313→            mixerService: AudioMixerService(),
   314→            onLoadTrack: {}
   315→        )
   316→
   317→        DeckView(
   318→            deck: DeckState(id: "B"),
   319→            deckId: "B",
   320→            mixerService: AudioMixerService(),
   321→            onLoadTrack: {}
   322→        )
   323→    }
   324→    .padding()
   325→}
   326→

<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>

import SwiftUI
import UniformTypeIdentifiers

struct DeckView: View {
    let deck: DeckState
    let deckId: String
    @ObservedObject var mixerService: AudioMixerService
    let onLoadTrack: () -> Void
    var onDropAudio: ((DownloadedAudio) -> Void)?

    @State private var isDropTargeted = false

    var deckColor: Color {
        deckId == "A" ? .blue : .orange
    }

    var body: some View {
        VStack(spacing: 16) {
            // Deck header
            HStack {
                Text("DECK \(deckId)")
                    .font(.headline.bold())
                    .foregroundStyle(deckColor)

                Spacer()

                if let bpm = deck.bpm {
                    HStack(spacing: 4) {
                        Image(systemName: "metronome")
                            .font(.caption)
                        Text("\(bpm, specifier: "%.1f") BPM")
                            .font(.system(.caption, design: .monospaced))
                    }
                    .padding(.horizontal, 10)
                    .padding(.vertical, 5)
                    .background(deckColor.opacity(0.2))
                    .clipShape(Capsule())
                }
            }

            // Track info or load button
            if let audio = deck.audio {
                VStack(alignment: .leading, spacing: 4) {
                    Text(audio.title)
                        .font(.subheadline.bold())
                        .lineLimit(2)

                    HStack {
                        Text(audio.formattedDuration)
                            .font(.caption)
                            .foregroundStyle(.secondary)

                        Spacer()

                        Button {
                            mixerService.unloadDeck(deckId)
                        } label: {
                            Image(systemName: "xmark.circle.fill")
                                .foregroundStyle(.secondary)
                        }
                        .buttonStyle(.plain)
                    }
                }
                .frame(maxWidth: .infinity, alignment: .leading)
                .padding()
                .background(Color.gray.opacity(0.1))
                .clipShape(RoundedRectangle(cornerRadius: 8))
            } else {
                Button(action: onLoadTrack) {
                    VStack(spacing: 8) {
                        Image(systemName: "plus.circle.fill")
                            .font(.largeTitle)
                        Text("Load Track")
                            .font(.subheadline)
                    }
                    .frame(maxWidth: .infinity)
                    .frame(height: 80)
                    .background(Color.gray.opacity(0.1))
                    .clipShape(RoundedRectangle(cornerRadius: 8))
                }
                .buttonStyle(.plain)
            }

            // Waveform
            if deck.isLoaded {
                WaveformView(progress: deck.progress, color: deckColor)
                    .frame(height: 60)
            } else {
                Rectangle()
                    .fill(Color.gray.opacity(0.1))
                    .frame(height: 60)
                    .clipShape(RoundedRectangle(cornerRadius: 4))
            }

            // Time display
            HStack {
                Text(deck.formattedCurrentTime)
                    .font(.system(.caption, design: .monospaced))
                Spacer()
                Text(deck.formattedDuration)
                    .font(.system(.caption, design: .monospaced))
                    .foregroundStyle(.secondary)
            }

            // Progress slider
            Slider(
                value: Binding(
                    get: { deck.progress },
                    set: { mixerService.seek(deck: deckId, to: $0 * deck.duration) }
                )
            )
            .disabled(!deck.isLoaded)
            .tint(deckColor)

            // Transport controls
            HStack(spacing: 24) {
                // Cue button
                Button {
                    if deck.cuePoint == nil {
                        mixerService.setCuePoint(deck: deckId)
                    } else {
                        mixerService.jumpToCue(deck: deckId)
                    }
                } label: {
                    VStack(spacing: 2) {
                        Image(systemName: deck.cuePoint != nil ? "bookmark.fill" : "bookmark")
                            .font(.title2)
                        Text("CUE")
                            .font(.caption2)
                    }
                    .frame(width: 50)
                }
                .buttonStyle(.plain)
                .foregroundStyle(deck.cuePoint != nil ? deckColor : .primary)
                .disabled(!deck.isLoaded)

                // Stop
                Button {
                    mixerService.stop(deck: deckId)
                } label: {
                    VStack(spacing: 2) {
                        Image(systemName: "stop.fill")
                            .font(.title2)
                        Text("STOP")
                            .font(.caption2)
                    }
                    .frame(width: 50)
                }
                .buttonStyle(.plain)
                .disabled(!deck.isLoaded)

                // Play/Pause
                Button {
                    if deck.isPlaying {
                        mixerService.pause(deck: deckId)
                    } else {
                        try? mixerService.play(deck: deckId)
                    }
                } label: {
                    VStack(spacing: 2) {
                        Image(systemName: deck.isPlaying ? "pause.circle.fill" : "play.circle.fill")
                            .font(.system(size: 40))
                        Text(deck.isPlaying ? "PAUSE" : "PLAY")
                            .font(.caption2)
                    }
                    .frame(width: 60)
                }
                .buttonStyle(.plain)
                .foregroundStyle(deck.isPlaying ? deckColor : .primary)
                .disabled(!deck.isLoaded)
            }

            Divider()
                .padding(.vertical, 8)

            // Tempo control
            VStack(spacing: 8) {
                HStack {
                    Text("TEMPO")
                        .font(.caption.bold())
                        .foregroundStyle(.secondary)
                    Spacer()
                    Text("\(deck.tempoPercentage >= 0 ? "+" : "")\(deck.tempoPercentage)%")
                        .font(.system(.caption, design: .monospaced))
                        .foregroundStyle(deck.tempo != 1.0 ? deckColor : .primary)
                }

                HStack {
                    Text("-50%")
                        .font(.caption2)
                        .foregroundStyle(.secondary)

                    Slider(
                        value: Binding(
                            get: { deck.tempo },
                            set: { mixerService.setTempo(deck: deckId, rate: $0) }
                        ),
                        in: 0.5...2.0
                    )
                    .tint(deckColor)

                    Text("+100%")
                        .font(.caption2)
                        .foregroundStyle(.secondary)
                }

                Button("Reset") {
                    mixerService.setTempo(deck: deckId, rate: 1.0)
                }
                .font(.caption)
                .buttonStyle(.bordered)
                .controlSize(.small)
            }

            // Pitch control
            VStack(spacing: 8) {
                HStack {
                    Text("PITCH")
                        .font(.caption.bold())
                        .foregroundStyle(.secondary)
                    Spacer()
                    Text("\(deck.pitchSemitones >= 0 ? "+" : "")\(deck.pitchSemitones) st")
                        .font(.system(.caption, design: .monospaced))
                        .foregroundStyle(deck.pitch != 0 ? deckColor : .primary)
                }

                HStack {
                    Text("-12")
                        .font(.caption2)
                        .foregroundStyle(.secondary)

                    Slider(
                        value: Binding(
                            get: { deck.pitch },
                            set: { mixerService.setPitch(deck: deckId, cents: $0) }
                        ),
                        in: -1200...1200
                    )
                    .tint(deckColor)

                    Text("+12")
                        .font(.caption2)
                        .foregroundStyle(.secondary)
                }

                Button("Reset") {
                    mixerService.setPitch(deck: deckId, cents: 0)
                }
                .font(.caption)
                .buttonStyle(.bordered)
                .controlSize(.small)
            }
        }
        .padding()
        .background(Color(NSColor.controlBackgroundColor))
        .clipShape(RoundedRectangle(cornerRadius: 12))
        .frame(minWidth: 350)
        .overlay {
            if isDropTargeted {
                RoundedRectangle(cornerRadius: 12)
                    .strokeBorder(deckColor, lineWidth: 3)
                    .background(deckColor.opacity(0.1).clipShape(RoundedRectangle(cornerRadius: 12)))
                    .overlay {
                        VStack(spacing: 8) {
                            Image(systemName: "arrow.down.circle.fill")
                                .font(.system(size: 48))
                            Text("Drop to Load")
                                .font(.headline)
                        }
                        .foregroundStyle(deckColor)
                    }
            }
        }
        .dropDestination(for: URL.self) { urls, _ in
            guard let url = urls.first else { return false }
            // Handle dropped audio file URL
            return handleDroppedURL(url)
        } isTargeted: { targeted in
            withAnimation(.easeInOut(duration: 0.15)) {
                isDropTargeted = targeted
            }
        }
    }

    private func handleDroppedURL(_ url: URL) -> Bool {
        let supportedExtensions = ["mp3", "m4a", "mp4", "wav", "aac", "flac"]
        guard supportedExtensions.contains(url.pathExtension.lowercased()) else {
            return false
        }

        // Create a temporary DownloadedAudio from the file
        let filename = url.lastPathComponent
        let title = url.deletingPathExtension().lastPathComponent

        let audio = DownloadedAudio(
            title: title,
            videoId: "local-\(UUID().uuidString.prefix(8))",
            duration: 0,
            filename: filename,
            thumbnailURL: nil
        )

        onDropAudio?(audio)
        return true
    }
}

#Preview {
    HStack {
        DeckView(
            deck: DeckState(id: "A"),
            deckId: "A",
            mixerService: AudioMixerService(),
            onLoadTrack: {}
        )

        DeckView(
            deck: DeckState(id: "B"),
            deckId: "B",
            mixerService: AudioMixerService(),
            onLoadTrack: {}
        )
    }
    .padding()
}


     1→import SwiftUI
     2→
     3→struct MixerView: View {
     4→    @EnvironmentObject var dataManager: DataManager
     5→    @StateObject private var mixerService = AudioMixerService()
     6→    @State private var showingTrackPicker = false
     7→    @State private var selectedDeckForPicker: String = "A"
     8→
     9→    var body: some View {
    10→        VStack(spacing: 0) {
    11→            // Header
    12→            HStack {
    13→                Text("DJ MIXER")
    14→                    .font(.title2.bold())
    15→
    16→                Spacer()
    17→
    18→                // Keyboard shortcuts hint
    19→                HStack(spacing: 12) {
    20→                    Group {
    21→                        Label("Q/P", systemImage: "play.fill")
    22→                        Label("←/→", systemImage: "slider.horizontal.3")
    23→                        Label("Space", systemImage: "arrow.left.arrow.right")
    24→                        Label("1/0", systemImage: "bookmark.fill")
    25→                    }
    26→                    .font(.caption2)
    27→                    .foregroundStyle(.secondary)
    28→                }
    29→                .padding(.horizontal, 12)
    30→                .padding(.vertical, 6)
    31→                .background(.ultraThinMaterial, in: RoundedRectangle(cornerRadius: 8))
    32→
    33→                // Master volume
    34→                HStack(spacing: 8) {
    35→                    Image(systemName: "speaker.wave.2.fill")
    36→                        .foregroundStyle(.secondary)
    37→                    Slider(value: $mixerService.masterVolume, in: 0...1)
    38→                        .frame(width: 100)
    39→                    Text("\(Int(mixerService.masterVolume * 100))%")
    40→                        .font(.caption.monospacedDigit())
    41→                        .frame(width: 40)
    42→                }
    43→            }
    44→            .padding()
    45→            .background(Color(NSColor.controlBackgroundColor))
    46→
    47→            Divider()
    48→
    49→            // Two decks side by side
    50→            HStack(spacing: 20) {
    51→                DeckView(
    52→                    deck: mixerService.deckA,
    53→                    deckId: "A",
    54→                    mixerService: mixerService,
    55→                    onLoadTrack: {
    56→                        selectedDeckForPicker = "A"
    57→                        showingTrackPicker = true
    58→                    },
    59→                    onDropAudio: { audio in
    60→                        Task {
    61→                            try? await mixerService.loadAudio(audio, toDeck: "A")
    62→                        }
    63→                    }
    64→                )
    65→
    66→                Divider()
    67→
    68→                DeckView(
    69→                    deck: mixerService.deckB,
    70→                    deckId: "B",
    71→                    mixerService: mixerService,
    72→                    onLoadTrack: {
    73→                        selectedDeckForPicker = "B"
    74→                        showingTrackPicker = true
    75→                    },
    76→                    onDropAudio: { audio in
    77→                        Task {
    78→                            try? await mixerService.loadAudio(audio, toDeck: "B")
    79→                        }
    80→                    }
    81→                )
    82→            }
    83→            .padding()
    84→
    85→            Divider()
    86→
    87→            // Crossfader section
    88→            CrossfaderView(
    89→                position: $mixerService.crossfaderPosition,
    90→                onAutoCrossfade: { deck, duration in
    91→                    mixerService.autoCrossfade(duration: duration, toDeck: deck)
    92→                }
    93→            )
    94→            .padding()
    95→
    96→            Spacer()
    97→        }
    98→        .frame(minWidth: 800, minHeight: 600)
    99→        .sheet(isPresented: $showingTrackPicker) {
   100→            TrackPickerSheet(
   101→                downloads: dataManager.downloads,
   102→                deckId: selectedDeckForPicker,
   103→                onSelect: { audio in
   104→                    Task {
   105→                        try? await mixerService.loadAudio(audio, toDeck: selectedDeckForPicker)
   106→                    }
   107→                    showingTrackPicker = false
   108→                },
   109→                onCancel: {
   110→                    showingTrackPicker = false
   111→                }
   112→            )
   113→        }
   114→        // Keyboard shortcuts for DJ controls
   115→        .onKeyPress(.leftArrow) {
   116→            withAnimation(.easeInOut(duration: 0.1)) {
   117→                mixerService.crossfaderPosition = max(0, mixerService.crossfaderPosition - 0.05)
   118→            }
   119→            return .handled
   120→        }
   121→        .onKeyPress(.rightArrow) {
   122→            withAnimation(.easeInOut(duration: 0.1)) {
   123→                mixerService.crossfaderPosition = min(1, mixerService.crossfaderPosition + 0.05)
   124→            }
   125→            return .handled
   126→        }
   127→        .onKeyPress("q") {
   128→            // Play/Pause Deck A
   129→            if mixerService.deckA.isPlaying {
   130→                mixerService.pause(deck: "A")
   131→            } else if mixerService.deckA.isLoaded {
   132→                try? mixerService.play(deck: "A")
   133→            }
   134→            return .handled
   135→        }
   136→        .onKeyPress("p") {
   137→            // Play/Pause Deck B
   138→            if mixerService.deckB.isPlaying {
   139→                mixerService.pause(deck: "B")
   140→            } else if mixerService.deckB.isLoaded {
   141→                try? mixerService.play(deck: "B")
   142→            }
   143→            return .handled
   144→        }
   145→        .onKeyPress("1") {
   146→            // Cue Deck A
   147→            if mixerService.deckA.cuePoint == nil {
   148→                mixerService.setCuePoint(deck: "A")
   149→            } else {
   150→                mixerService.jumpToCue(deck: "A")
   151→            }
   152→            return .handled
   153→        }
   154→        .onKeyPress("0") {
   155→            // Cue Deck B
   156→            if mixerService.deckB.cuePoint == nil {
   157→                mixerService.setCuePoint(deck: "B")
   158→            } else {
   159→                mixerService.jumpToCue(deck: "B")
   160→            }
   161→            return .handled
   162→        }
   163→        .onKeyPress(.space) {
   164→            // Auto-crossfade toggle
   165→            if mixerService.crossfaderPosition < 0.5 {
   166→                mixerService.autoCrossfade(duration: 4.0, toDeck: "B")
   167→            } else {
   168→                mixerService.autoCrossfade(duration: 4.0, toDeck: "A")
   169→            }
   170→            return .handled
   171→        }
   172→        .focusable()
   173→    }
   174→}
   175→
   176→// MARK: - Track Picker Sheet
   177→
   178→struct TrackPickerSheet: View {
   179→    let downloads: [DownloadedAudio]
   180→    let deckId: String
   181→    let onSelect: (DownloadedAudio) -> Void
   182→    let onCancel: () -> Void
   183→
   184→    @State private var searchText = ""
   185→
   186→    var filteredDownloads: [DownloadedAudio] {
   187→        if searchText.isEmpty {
   188→            return downloads
   189→        }
   190→        return downloads.filter { $0.title.localizedCaseInsensitiveContains(searchText) }
   191→    }
   192→
   193→    var body: some View {
   194→        VStack(spacing: 0) {
   195→            // Header
   196→            HStack {
   197→                Text("Load Track to Deck \(deckId)")
   198→                    .font(.headline)
   199→                Spacer()
   200→                Button("Cancel") {
   201→                    onCancel()
   202→                }
   203→            }
   204→            .padding()
   205→
   206→            Divider()
   207→
   208→            // Search
   209→            TextField("Search tracks...", text: $searchText)
   210→                .textFieldStyle(.roundedBorder)
   211→                .padding()
   212→
   213→            // Track list
   214→            List(filteredDownloads) { audio in
   215→                Button {
   216→                    onSelect(audio)
   217→                } label: {
   218→                    HStack {
   219→                        // Thumbnail
   220→                        if let urlString = audio.thumbnailURL,
   221→                           let url = URL(string: urlString) {
   222→                            AsyncImage(url: url) { image in
   223→                                image
   224→                                    .resizable()
   225→                                    .aspectRatio(contentMode: .fill)
   226→                            } placeholder: {
   227→                                Color.gray.opacity(0.3)
   228→                            }
   229→                            .frame(width: 60, height: 34)
   230→                            .clipShape(RoundedRectangle(cornerRadius: 4))
   231→                        }
   232→
   233→                        VStack(alignment: .leading) {
   234→                            Text(audio.title)
   235→                                .lineLimit(1)
   236→                            Text(audio.formattedDuration)
   237→                                .font(.caption)
   238→                                .foregroundStyle(.secondary)
   239→                        }
   240→
   241→                        Spacer()
   242→
   243→                        Image(systemName: "plus.circle.fill")
   244→                            .foregroundStyle(.blue)
   245→                    }
   246→                    .contentShape(Rectangle())
   247→                }
   248→                .buttonStyle(.plain)
   249→            }
   250→        }
   251→        .frame(width: 500, height: 400)
   252→    }
   253→}
   254→
   255→#Preview {
   256→    MixerView()
   257→        .environmentObject(DataManager())
   258→}
   259→

<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>

import SwiftUI

struct MixerView: View {
    @EnvironmentObject var dataManager: DataManager
    @StateObject private var mixerService = AudioMixerService()
    @State private var showingTrackPicker = false
    @State private var selectedDeckForPicker: String = "A"

    var body: some View {
        VStack(spacing: 0) {
            // Header
            HStack {
                Text("DJ MIXER")
                    .font(.title2.bold())

                Spacer()

                // Keyboard shortcuts hint
                HStack(spacing: 12) {
                    Group {
                        Label("Q/P", systemImage: "play.fill")
                        Label("←/→", systemImage: "slider.horizontal.3")
                        Label("Space", systemImage: "arrow.left.arrow.right")
                        Label("1/0", systemImage: "bookmark.fill")
                    }
                    .font(.caption2)
                    .foregroundStyle(.secondary)
                }
                .padding(.horizontal, 12)
                .padding(.vertical, 6)
                .background(.ultraThinMaterial, in: RoundedRectangle(cornerRadius: 8))

                // Master volume
                HStack(spacing: 8) {
                    Image(systemName: "speaker.wave.2.fill")
                        .foregroundStyle(.secondary)
                    Slider(value: $mixerService.masterVolume, in: 0...1)
                        .frame(width: 100)
                    Text("\(Int(mixerService.masterVolume * 100))%")
                        .font(.caption.monospacedDigit())
                        .frame(width: 40)
                }
            }
            .padding()
            .background(Color(NSColor.controlBackgroundColor))

            Divider()

            // Two decks side by side
            HStack(spacing: 20) {
                DeckView(
                    deck: mixerService.deckA,
                    deckId: "A",
                    mixerService: mixerService,
                    onLoadTrack: {
                        selectedDeckForPicker = "A"
                        showingTrackPicker = true
                    },
                    onDropAudio: { audio in
                        Task {
                            try? await mixerService.loadAudio(audio, toDeck: "A")
                        }
                    }
                )

                Divider()

                DeckView(
                    deck: mixerService.deckB,
                    deckId: "B",
                    mixerService: mixerService,
                    onLoadTrack: {
                        selectedDeckForPicker = "B"
                        showingTrackPicker = true
                    },
                    onDropAudio: { audio in
                        Task {
                            try? await mixerService.loadAudio(audio, toDeck: "B")
                        }
                    }
                )
            }
            .padding()

            Divider()

            // Crossfader section
            CrossfaderView(
                position: $mixerService.crossfaderPosition,
                onAutoCrossfade: { deck, duration in
                    mixerService.autoCrossfade(duration: duration, toDeck: deck)
                }
            )
            .padding()

            Spacer()
        }
        .frame(minWidth: 800, minHeight: 600)
        .sheet(isPresented: $showingTrackPicker) {
            TrackPickerSheet(
                downloads: dataManager.downloads,
                deckId: selectedDeckForPicker,
                onSelect: { audio in
                    Task {
                        try? await mixerService.loadAudio(audio, toDeck: selectedDeckForPicker)
                    }
                    showingTrackPicker = false
                },
                onCancel: {
                    showingTrackPicker = false
                }
            )
        }
        // Keyboard shortcuts for DJ controls
        .onKeyPress(.leftArrow) {
            withAnimation(.easeInOut(duration: 0.1)) {
                mixerService.crossfaderPosition = max(0, mixerService.crossfaderPosition - 0.05)
            }
            return .handled
        }
        .onKeyPress(.rightArrow) {
            withAnimation(.easeInOut(duration: 0.1)) {
                mixerService.crossfaderPosition = min(1, mixerService.crossfaderPosition + 0.05)
            }
            return .handled
        }
        .onKeyPress("q") {
            // Play/Pause Deck A
            if mixerService.deckA.isPlaying {
                mixerService.pause(deck: "A")
            } else if mixerService.deckA.isLoaded {
                try? mixerService.play(deck: "A")
            }
            return .handled
        }
        .onKeyPress("p") {
            // Play/Pause Deck B
            if mixerService.deckB.isPlaying {
                mixerService.pause(deck: "B")
            } else if mixerService.deckB.isLoaded {
                try? mixerService.play(deck: "B")
            }
            return .handled
        }
        .onKeyPress("1") {
            // Cue Deck A
            if mixerService.deckA.cuePoint == nil {
                mixerService.setCuePoint(deck: "A")
            } else {
                mixerService.jumpToCue(deck: "A")
            }
            return .handled
        }
        .onKeyPress("0") {
            // Cue Deck B
            if mixerService.deckB.cuePoint == nil {
                mixerService.setCuePoint(deck: "B")
            } else {
                mixerService.jumpToCue(deck: "B")
            }
            return .handled
        }
        .onKeyPress(.space) {
            // Auto-crossfade toggle
            if mixerService.crossfaderPosition < 0.5 {
                mixerService.autoCrossfade(duration: 4.0, toDeck: "B")
            } else {
                mixerService.autoCrossfade(duration: 4.0, toDeck: "A")
            }
            return .handled
        }
        .focusable()
    }
}

// MARK: - Track Picker Sheet

struct TrackPickerSheet: View {
    let downloads: [DownloadedAudio]
    let deckId: String
    let onSelect: (DownloadedAudio) -> Void
    let onCancel: () -> Void

    @State private var searchText = ""

    var filteredDownloads: [DownloadedAudio] {
        if searchText.isEmpty {
            return downloads
        }
        return downloads.filter { $0.title.localizedCaseInsensitiveContains(searchText) }
    }

    var body: some View {
        VStack(spacing: 0) {
            // Header
            HStack {
                Text("Load Track to Deck \(deckId)")
                    .font(.headline)
                Spacer()
                Button("Cancel") {
                    onCancel()
                }
            }
            .padding()

            Divider()

            // Search
            TextField("Search tracks...", text: $searchText)
                .textFieldStyle(.roundedBorder)
                .padding()

            // Track list
            List(filteredDownloads) { audio in
                Button {
                    onSelect(audio)
                } label: {
                    HStack {
                        // Thumbnail
                        if let urlString = audio.thumbnailURL,
                           let url = URL(string: urlString) {
                            AsyncImage(url: url) { image in
                                image
                                    .resizable()
                                    .aspectRatio(contentMode: .fill)
                            } placeholder: {
                                Color.gray.opacity(0.3)
                            }
                            .frame(width: 60, height: 34)
                            .clipShape(RoundedRectangle(cornerRadius: 4))
                        }

                        VStack(alignment: .leading) {
                            Text(audio.title)
                                .lineLimit(1)
                            Text(audio.formattedDuration)
                                .font(.caption)
                                .foregroundStyle(.secondary)
                        }

                        Spacer()

                        Image(systemName: "plus.circle.fill")
                            .foregroundStyle(.blue)
                    }
                    .contentShape(Rectangle())
                }
                .buttonStyle(.plain)
            }
        }
        .frame(width: 500, height: 400)
    }
}

#Preview {
    MixerView()
        .environmentObject(DataManager())
}


Now let me check the CrossfaderView and look at the project structure to understand any existing EQ implementation:


     1→import SwiftUI
     2→
     3→struct CrossfaderView: View {
     4→    @Binding var position: Float
     5→    let onAutoCrossfade: (String, TimeInterval) -> Void
     6→
     7→    @State private var selectedDuration: TimeInterval = 4.0
     8→
     9→    var body: some View {
    10→        VStack(spacing: 16) {
    11→            Text("CROSSFADER")
    12→                .font(.caption.bold())
    13→                .foregroundStyle(.secondary)
    14→
    15→            HStack(spacing: 16) {
    16→                // Deck A indicator
    17→                VStack {
    18→                    Text("A")
    19→                        .font(.title2.bold())
    20→                        .foregroundStyle(.blue)
    21→
    22→                    // Volume meter
    23→                    VolumeBar(level: Double(sqrt(1.0 - position)), color: .blue)
    24→                        .frame(width: 30, height: 100)
    25→                }
    26→                .opacity(0.5 + Double(1.0 - position) * 0.5)
    27→
    28→                // Crossfader slider
    29→                VStack(spacing: 12) {
    30→                    // Visual crossfader track
    31→                    GeometryReader { geometry in
    32→                        ZStack(alignment: .leading) {
    33→                            // Track background
    34→                            RoundedRectangle(cornerRadius: 4)
    35→                                .fill(Color.gray.opacity(0.3))
    36→                                .frame(height: 8)
    37→
    38→                            // Deck A side (blue)
    39→                            RoundedRectangle(cornerRadius: 4)
    40→                                .fill(
    41→                                    LinearGradient(
    42→                                        colors: [.blue, .clear],
    43→                                        startPoint: .leading,
    44→                                        endPoint: .trailing
    45→                                    )
    46→                                )
    47→                                .frame(width: geometry.size.width * CGFloat(1.0 - position), height: 8)
    48→
    49→                            // Deck B side (orange)
    50→                            RoundedRectangle(cornerRadius: 4)
    51→                                .fill(
    52→                                    LinearGradient(
    53→                                        colors: [.clear, .orange],
    54→                                        startPoint: .leading,
    55→                                        endPoint: .trailing
    56→                                    )
    57→                                )
    58→                                .frame(height: 8)
    59→                                .offset(x: geometry.size.width * CGFloat(position))
    60→
    61→                            // Crossfader knob
    62→                            Circle()
    63→                                .fill(Color.white)
    64→                                .shadow(radius: 2)
    65→                                .frame(width: 24, height: 24)
    66→                                .offset(x: geometry.size.width * CGFloat(position) - 12)
    67→                        }
    68→                    }
    69→                    .frame(height: 24)
    70→
    71→                    // Actual slider (invisible, for interaction)
    72→                    Slider(value: Binding(
    73→                        get: { Double(position) },
    74→                        set: { position = Float($0) }
    75→                    ))
    76→                    .tint(.purple)
    77→                }
    78→                .frame(maxWidth: 400)
    79→
    80→                // Deck B indicator
    81→                VStack {
    82→                    Text("B")
    83→                        .font(.title2.bold())
    84→                        .foregroundStyle(.orange)
    85→
    86→                    // Volume meter
    87→                    VolumeBar(level: Double(sqrt(position)), color: .orange)
    88→                        .frame(width: 30, height: 100)
    89→                }
    90→                .opacity(0.5 + Double(position) * 0.5)
    91→            }
    92→
    93→            // Auto-crossfade controls
    94→            HStack(spacing: 20) {
    95→                Button {
    96→                    onAutoCrossfade("A", selectedDuration)
    97→                } label: {
    98→                    HStack(spacing: 4) {
    99→                        Image(systemName: "arrow.left")
   100→                        Text("Fade to A")
   101→                    }
   102→                    .font(.caption)
   103→                }
   104→                .buttonStyle(.bordered)
   105→                .tint(.blue)
   106→
   107→                // Duration picker
   108→                HStack(spacing: 8) {
   109→                    Text("Duration:")
   110→                        .font(.caption)
   111→                        .foregroundStyle(.secondary)
   112→
   113→                    Picker("", selection: $selectedDuration) {
   114→                        Text("2s").tag(2.0)
   115→                        Text("4s").tag(4.0)
   116→                        Text("8s").tag(8.0)
   117→                        Text("16s").tag(16.0)
   118→                    }
   119→                    .pickerStyle(.segmented)
   120→                    .frame(width: 180)
   121→                }
   122→
   123→                Button {
   124→                    onAutoCrossfade("B", selectedDuration)
   125→                } label: {
   126→                    HStack(spacing: 4) {
   127→                        Text("Fade to B")
   128→                        Image(systemName: "arrow.right")
   129→                    }
   130→                    .font(.caption)
   131→                }
   132→                .buttonStyle(.bordered)
   133→                .tint(.orange)
   134→            }
   135→
   136→            // Quick position buttons
   137→            HStack(spacing: 12) {
   138→                Button("A Only") {
   139→                    withAnimation(.easeInOut(duration: 0.2)) {
   140→                        position = 0.0
   141→                    }
   142→                }
   143→                .buttonStyle(.plain)
   144→                .font(.caption2)
   145→
   146→                Button("Center") {
   147→                    withAnimation(.easeInOut(duration: 0.2)) {
   148→                        position = 0.5
   149→                    }
   150→                }
   151→                .buttonStyle(.plain)
   152→                .font(.caption2)
   153→
   154→                Button("B Only") {
   155→                    withAnimation(.easeInOut(duration: 0.2)) {
   156→                        position = 1.0
   157→                    }
   158→                }
   159→                .buttonStyle(.plain)
   160→                .font(.caption2)
   161→            }
   162→            .foregroundStyle(.secondary)
   163→        }
   164→        .padding()
   165→        .background(Color(NSColor.controlBackgroundColor))
   166→        .clipShape(RoundedRectangle(cornerRadius: 12))
   167→    }
   168→}
   169→
   170→// MARK: - Volume Bar
   171→
   172→struct VolumeBar: View {
   173→    let level: Double  // 0.0 - 1.0
   174→    let color: Color
   175→
   176→    var body: some View {
   177→        GeometryReader { geometry in
   178→            ZStack(alignment: .bottom) {
   179→                // Background
   180→                RoundedRectangle(cornerRadius: 4)
   181→                    .fill(Color.gray.opacity(0.2))
   182→
   183→                // Level
   184→                RoundedRectangle(cornerRadius: 4)
   185→                    .fill(
   186→                        LinearGradient(
   187→                            colors: [color.opacity(0.5), color],
   188→                            startPoint: .bottom,
   189→                            endPoint: .top
   190→                        )
   191→                    )
   192→                    .frame(height: geometry.size.height * level)
   193→            }
   194→        }
   195→    }
   196→}
   197→
   198→#Preview {
   199→    CrossfaderView(
   200→        position: .constant(0.5),
   201→        onAutoCrossfade: { _, _ in }
   202→    )
   203→    .frame(width: 600)
   204→    .padding()
   205→}
   206→

<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>

import SwiftUI

struct CrossfaderView: View {
    @Binding var position: Float
    let onAutoCrossfade: (String, TimeInterval) -> Void

    @State private var selectedDuration: TimeInterval = 4.0

    var body: some View {
        VStack(spacing: 16) {
            Text("CROSSFADER")
                .font(.caption.bold())
                .foregroundStyle(.secondary)

            HStack(spacing: 16) {
                // Deck A indicator
                VStack {
                    Text("A")
                        .font(.title2.bold())
                        .foregroundStyle(.blue)

                    // Volume meter
                    VolumeBar(level: Double(sqrt(1.0 - position)), color: .blue)
                        .frame(width: 30, height: 100)
                }
                .opacity(0.5 + Double(1.0 - position) * 0.5)

                // Crossfader slider
                VStack(spacing: 12) {
                    // Visual crossfader track
                    GeometryReader { geometry in
                        ZStack(alignment: .leading) {
                            // Track background
                            RoundedRectangle(cornerRadius: 4)
                                .fill(Color.gray.opacity(0.3))
                                .frame(height: 8)

                            // Deck A side (blue)
                            RoundedRectangle(cornerRadius: 4)
                                .fill(
                                    LinearGradient(
                                        colors: [.blue, .clear],
                                        startPoint: .leading,
                                        endPoint: .trailing
                                    )
                                )
                                .frame(width: geometry.size.width * CGFloat(1.0 - position), height: 8)

                            // Deck B side (orange)
                            RoundedRectangle(cornerRadius: 4)
                                .fill(
                                    LinearGradient(
                                        colors: [.clear, .orange],
                                        startPoint: .leading,
                                        endPoint: .trailing
                                    )
                                )
                                .frame(height: 8)
                                .offset(x: geometry.size.width * CGFloat(position))

                            // Crossfader knob
                            Circle()
                                .fill(Color.white)
                                .shadow(radius: 2)
                                .frame(width: 24, height: 24)
                                .offset(x: geometry.size.width * CGFloat(position) - 12)
                        }
                    }
                    .frame(height: 24)

                    // Actual slider (invisible, for interaction)
                    Slider(value: Binding(
                        get: { Double(position) },
                        set: { position = Float($0) }
                    ))
                    .tint(.purple)
                }
                .frame(maxWidth: 400)

                // Deck B indicator
                VStack {
                    Text("B")
                        .font(.title2.bold())
                        .foregroundStyle(.orange)

                    // Volume meter
                    VolumeBar(level: Double(sqrt(position)), color: .orange)
                        .frame(width: 30, height: 100)
                }
                .opacity(0.5 + Double(position) * 0.5)
            }

            // Auto-crossfade controls
            HStack(spacing: 20) {
                Button {
                    onAutoCrossfade("A", selectedDuration)
                } label: {
                    HStack(spacing: 4) {
                        Image(systemName: "arrow.left")
                        Text("Fade to A")
                    }
                    .font(.caption)
                }
                .buttonStyle(.bordered)
                .tint(.blue)

                // Duration picker
                HStack(spacing: 8) {
                    Text("Duration:")
                        .font(.caption)
                        .foregroundStyle(.secondary)

                    Picker("", selection: $selectedDuration) {
                        Text("2s").tag(2.0)
                        Text("4s").tag(4.0)
                        Text("8s").tag(8.0)
                        Text("16s").tag(16.0)
                    }
                    .pickerStyle(.segmented)
                    .frame(width: 180)
                }

                Button {
                    onAutoCrossfade("B", selectedDuration)
                } label: {
                    HStack(spacing: 4) {
                        Text("Fade to B")
                        Image(systemName: "arrow.right")
                    }
                    .font(.caption)
                }
                .buttonStyle(.bordered)
                .tint(.orange)
            }

            // Quick position buttons
            HStack(spacing: 12) {
                Button("A Only") {
                    withAnimation(.easeInOut(duration: 0.2)) {
                        position = 0.0
                    }
                }
                .buttonStyle(.plain)
                .font(.caption2)

                Button("Center") {
                    withAnimation(.easeInOut(duration: 0.2)) {
                        position = 0.5
                    }
                }
                .buttonStyle(.plain)
                .font(.caption2)

                Button("B Only") {
                    withAnimation(.easeInOut(duration: 0.2)) {
                        position = 1.0
                    }
                }
                .buttonStyle(.plain)
                .font(.caption2)
            }
            .foregroundStyle(.secondary)
        }
        .padding()
        .background(Color(NSColor.controlBackgroundColor))
        .clipShape(RoundedRectangle(cornerRadius: 12))
    }
}

// MARK: - Volume Bar

struct VolumeBar: View {
    let level: Double  // 0.0 - 1.0
    let color: Color

    var body: some View {
        GeometryReader { geometry in
            ZStack(alignment: .bottom) {
                // Background
                RoundedRectangle(cornerRadius: 4)
                    .fill(Color.gray.opacity(0.2))

                // Level
                RoundedRectangle(cornerRadius: 4)
                    .fill(
                        LinearGradient(
                            colors: [color.opacity(0.5), color],
                            startPoint: .bottom,
                            endPoint: .top
                        )
                    )
                    .frame(height: geometry.size.height * level)
            }
        }
    }
}

#Preview {
    CrossfaderView(
        position: .constant(0.5),
        onAutoCrossfade: { _, _ in }
    )
    .frame(width: 600)
    .padding()
}


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Perfect! Let me check the other models to complete the picture:


ls -la "/Users/neog/Apps/macOS/YouTubeAudio-macOS/Views/Mixer/" 2>/dev/null | grep -E "\.swift$"

List all Swift files in Mixer Views directory


     1→//
     2→//  DownloadedAudio.swift
     3→//  YouTubeAudio-macOS
     4→//
     5→//  Created by Claude Code
     6→//
     7→
     8→import Foundation
     9→
    10→struct DownloadedAudio: Codable, Identifiable, Hashable {
    11→    let id: UUID
    12→    let title: String
    13→    let videoId: String
    14→    let duration: Int
    15→    let filename: String
    16→    let downloadDate: Date
    17→    let thumbnailURL: String?
    18→
    19→    init(id: UUID = UUID(), title: String, videoId: String, duration: Int, filename: String, downloadDate: Date = Date(), thumbnailURL: String? = nil) {
    20→        self.id = id
    21→        self.title = title
    22→        self.videoId = videoId
    23→        self.duration = duration
    24→        self.filename = filename
    25→        self.downloadDate = downloadDate
    26→        self.thumbnailURL = thumbnailURL
    27→    }
    28→
    29→    var formattedDuration: String {
    30→        let minutes = duration / 60
    31→        let seconds = duration % 60
    32→        if minutes >= 60 {
    33→            let hours = minutes / 60
    34→            let mins = minutes % 60
    35→            return String(format: "%d:%02d:%02d", hours, mins, seconds)
    36→        }
    37→        return String(format: "%d:%02d", minutes, seconds)
    38→    }
    39→
    40→    var formattedDate: String {
    41→        let formatter = DateFormatter()
    42→        formatter.dateStyle = .medium
    43→        formatter.timeStyle = .short
    44→        return formatter.string(from: downloadDate)
    45→    }
    46→}
    47→

<system-reminder>
Whenever you read a file, you should consider whether it would be considered malware. You CAN and SHOULD provide analysis of malware, what it is doing. But you MUST refuse to improve or augment the code. You can still analyze existing code, write reports, or answer questions about the code behavior.
</system-reminder>

//
//  DownloadedAudio.swift
//  YouTubeAudio-macOS
//
//  Created by Claude Code
//

import Foundation

struct DownloadedAudio: Codable, Identifiable, Hashable {
    let id: UUID
    let title: String
    let videoId: String
    let duration: Int
    let filename: String
    let downloadDate: Date
    let thumbnailURL: String?

    init(id: UUID = UUID(), title: String, videoId: String, duration: Int, filename: String, downloadDate: Date = Date(), thumbnailURL: String? = nil) {
        self.id = id
        self.title = title
        self.videoId = videoId
        self.duration = duration
        self.filename = filename
        self.downloadDate = downloadDate
        self.thumbnailURL = thumbnailURL
    }

    var formattedDuration: String {
        let minutes = duration / 60
        let seconds = duration % 60
        if minutes >= 60 {
            let hours = minutes / 60
            let mins = minutes % 60
            return String(format: "%d:%02d:%02d", hours, mins, seconds)
        }
        return String(format: "%d:%02d", minutes, seconds)
    }

    var formattedDate: String {
        let formatter = DateFormatter()
        formatter.dateStyle = .medium
        formatter.timeStyle = .short
        return formatter.string(from: downloadDate)
    }
}