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Phase 8: Add stereo track mixer, automation and undo/redo

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Johannes Findeisen 2026-10-27 01:06:57 +01:00
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@ -118,3 +118,15 @@ prepared MIDI runtime state exclusively while active, with lock-free panic
requests and no callback allocation/I/O. Stop/seek clear live voices; scheduled
notes chase their absolute phase. See MIDI.md for event ordering, panic semantics,
capacities and test coverage. No new dependency is required.
## Phase 8 mix snapshots and history
`src/mixer` owns validated per-track settings and bounded gain/pan automation.
Audio/MIDI preparation copies and indexes these into source snapshots; paired
source buffers feed the same graph independently per stereo side. Atomic backend
output-peak snapshots cross to the GUI without exposing DSP state. Mixer edits
stop transport before subsequent preparation. `src/project/history.c` provides
32-edit C project snapshots; checkout clones a candidate and accept moves the
cursor only after successful GUI/backend installation. No samples or FLTK state
are stored in history. `mixer_widget.cpp` is only controls/drawing/gestures.
See MIXER.md and PROJECT_FORMAT.md for ownership, limits and v4 migration.