Sebastian Krüger d566a86c58 feat: implement multi-track playback system (Phase 7.3) ...

Added real-time multi-track audio mixing and playback:

**useMultiTrackPlayer Hook:**
- Real-time multi-track audio mixing with Web Audio API
- Synchronized playback across all tracks
- Dynamic gain control respecting solo/mute states
- Per-track panning with constant power panning
- Seek functionality with automatic resume
- Playback position tracking with requestAnimationFrame
- Automatic duration calculation from longest track
- Clean resource management and cleanup

**Features:**
- ✅ Play/Pause/Stop controls for multi-track
- ✅ Solo/Mute handling (if any track is soloed, only soloed tracks play)
- ✅ Per-track volume control (0-1 range)
- ✅ Per-track pan control (-1 left to +1 right)
- ✅ Real-time parameter updates during playback
- ✅ Seamless seek with playback state preservation
- ✅ Automatic stop when reaching end of longest track

**Audio Graph Architecture:**
For each track: BufferSource → GainNode → StereoPannerNode → Destination

The mixer applies:
- Volume attenuation based on track volume setting
- Solo/Mute logic (getTrackGain utility)
- Constant power panning for smooth stereo positioning

Next: Integrate multi-track UI into AudioEditor

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

2025-11-17 21:03:39 +01:00

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