Sebastian Krüger dac8ac4723 feat: implement real-time automation playback for volume and pan ...

Phase 9.3 - Automation Playback:
- Added real-time automation evaluation during playback
- Automation values are applied continuously via requestAnimationFrame
- Volume automation: Interpolates between points and applies to gain nodes
- Pan automation: Converts 0-1 values to -1 to 1 for StereoPannerNode

Implementation details:
- New applyAutomation() function runs in RAF loop alongside level monitoring
- Evaluates automation at current playback time using evaluateAutomationLinear
- Applies values using setValueAtTime for smooth Web Audio API parameter changes
- Automation loop lifecycle matches playback (start/pause/stop/cleanup)
- Respects automation mode (only applies when mode !== 'read')

Technical improvements:
- Added automationFrameRef for RAF management
- Proper cleanup in pause(), unmount, and playback end scenarios
- Integrated with existing effect chain restart mechanism
- Volume automation multiplied with track gain (mute/solo state)

Next steps:
- Effect parameter automation (TODO in code)
- Automation recording (write mode implementation)
- Touch and latch modes

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

2025-11-18 19:06:02 +01:00

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