Close three real parser divergences the conformance suite flagged on the device
side (pico-cp + pico-explorer) — cases where the firmware produced a different
groove/sound than the web for the same patch:
- Euclidean (k,n,rot) shorthand (e.g. kick:4(3,8)) — was silently dropped to a
plain bar; now expands to the same hits as engine.js (added _euclid + parsing).
- GM note-number lane sounds (e.g. 36:4) — now resolve to the voice name (GM_NUM).
- Unknown sound names fall back to beep, matching the web.
vol/cd are NOT carried by the firmware by design: they are web-authoring fields
(the device has a hardware volume knob and no count-in). Documented as an
intentional, permanent host difference rather than a bug; the vol-and-countin
vector stays as expectFail[py] to mark the boundary.
tests/adapters/py_adapter.py: extract the new SOUND_GM/GM_NUM/_euclid nodes.
fixtures: euclid/unknown-sound/gm-note-number now pass on both engines.
docs §6 updated. node tests/run.mjs: 33 pass / 9 known, round-trips stable.
pico-explorer parser spot-checked identical to pico-cp.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Single source of truth for the track ("program"/"patch") grammar, which was
implemented by hand in src/engine.js and pico-cp/app.py with no cross-check and
had quietly drifted.
- docs/track-format.md: formal grammar, container (programs.json) schema with a
version field, the new per-track playback-flow model (rep/end + relative goto;
default = loop forever), normalization rules, and a list of known divergences.
- tests/: golden vectors + a runner that loads the REAL engine.js and app.py
grammar (no copies; app.py via ast extraction) and compares both against the
spec. Exit non-zero on unexpected mismatch or round-trip break -> usable as CI.
Surfaces real divergences for follow-up: default accent pattern (no =pattern)
differs web vs device and affects shipped presets; euclid not parsed on device;
vol/cd dropped on device; unknown-sound fallback; tempo clamp; empty patch.
The rep/end playback-flow vectors are the acceptance test for building that.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
