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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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docs/decisions/0007-track-mixer-automation-and-history.md Normal file
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# 0007 — Track mixing, paired stereo buses and snapshot history
Status: accepted, Phase 8.
Apply gain/pan/mute/solo and gain/pan automation in prepared track sources, then
run paired stereo buses through the existing modular topology. This preserves
mono APIs and graph edits without inventing new graph-port IDs. Center-unity
linear pan preserves previous centered levels. Add optional stereo JACK output
and atomic output peak snapshots; keep input/recording mono.
Use 1024 global automation points, linear sample interpolation, and stopped
preparation for mixer edits. Store settings/points in v4 and migrate v1–v3 to
unity/center/no automation. Use 32 bounded C project snapshots for common undo
edits; commit history movement only after candidate installation succeeds.
Samples and GUI-only state stay outside history. Track graph inserts/sends,
per-track meters, live fader publication, automation modes/capture, nonlinear
curves and equal-power pan are future extensions. See ../MIXER.md.