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S4 Tier 0: the bank plays — VST3 marshals MIDI to the S3 core, reads the live bank + resolves WAV the M4 way, mono downmix, lock-free load handoff, LICE sample-pick

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Daniel Harvey
2026-07-26 16:43:04 -04:00
parent b0fc052113
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PLAN.md
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@@ -193,15 +193,22 @@ following the active project works; it never captures and never inserts into the
arrange (read-only over the bank).
**Depends on:** S1, S2, S3.
- [ ] VST3 `process` marshalling: read MIDI note-on/off/velocity off the event bus,
drive the S3 core, write per-voice audio to the output bus.
- [ ] Live-state seam: read the bank index + selected sample's root note from
- [x] VST3 `process` marshalling: read MIDI note-on/off/velocity off the event bus,
drive the S3 core, write per-voice audio to the output bus. (Block-granular event
timing at Tier 0; sample-accurate offset scheduling is a later tier.)
- [x] Live-state seam: read the bank index + selected sample's root note from
`"reasampler"` ext-state via the bridge; resolve the WAV audio path the M4
project-relative way (shared convention with `persist`, not re-implemented).
- [ ] Sample selection UI (minimal, in the `IPlugView` LICE editor or a
parameters-only default view): choose which bank sample this instance plays.
- [ ] Tier-0 playback: chromatic-from-root, basic polyphony, amp envelope,
velocity→volume — plays in REAPER's routing/record/render path like any VSTi.
project-relative way (shared convention with `persist`, not re-implemented — the
parent-of-.rpp derivation is extracted to `capture_paths::projectDirOfRpp`, which both
`persist` and the bridge call). Bank JSON parsed via the shared `bank_book` path (the
spike string-scan reader retired); ext-state key names shared via pure `ext_keys.h`.
- [x] Sample selection UI (minimal, in the `IPlugView` LICE editor): a clickable list
of the bank's samples; the pick is the instance's own VST3 component state
(setState/getState), never written back to the bank.
- [x] Tier-0 playback: chromatic-from-root, basic polyphony (16 voices), amp envelope,
velocity→volume — plays in REAPER's routing/record/render path like any VSTi. Sample
load / decode / keymap build happen off the audio thread and hand to `process` via a
lock-free atomic pointer swap (graveyard-reclaim); `process` never allocates.
## S5 — Tier 1: "a keymap" (zoned multisamples, per-sample root notes)
**Goal:** Multiple bank samples zoned across the keyboard (key ranges), each with its