feat(drums): capture velocities alongside times in unmapped-percussion reporting

Both drum converters opt-in out_unmapped capture (convert_drum_track_from_midi,
convert_drum_track_to_drumtab) gain an index-aligned `velocities` list next to
`times`, carrying each dropped note real dynamics — MIDI velocity verbatim; GP
velocity with the same 1-127 gate as mapped hits, falling back to the 100
import default. A hand-mapping UI (the editor unmapped-notes dialog) can then
restore mapped notes at their source dynamics instead of flattening to v:100
(editor-side consumer: feedBack-plugin-editor#111).

The GP path chronological sort now reorders times and velocities in LOCKSTEP
so multi-voice measures cannot silently reassign dynamics. Additive: callers
that ignore the new key are unaffected.

Tests: extended tests/test_midi_import_drums.py + tests/test_gp2rs_drums.py
(alignment, lockstep sort, out-of-range fallback) — 26 passing.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JEoFeTPSnz4NpwwCG52hnu

CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - **Auto-sync: DTW step constraint — riff-based songs no longer produce garbage sync points.** `librosa.sequence.dtw`'s default step pattern allows unbounded horizontal/vertical path runs, and on music with long self-similar chroma stretches (riff-driven stoner/doom, drone sections) the flat cost surface let the warping path collapse — minutes of score mapped onto a single audio frame, so the per-bar warp imported charts wildly out of sync while reporting success (observed on a real 138 BPM tab: effective displayed tempo 159 BPM, three sync points sharing one audio timestamp). `_dtw_align` now uses the standard music-sync slope-constrained step pattern (`[[1,1],[1,2],[2,1]]`, local tempo ratio bounded to 0.5x–2x), which makes the degenerate path impossible, with a fallback to unconstrained steps when the global length ratio makes the constrained pattern infeasible (e.g. a tab aligned against a full-concert video). Validated on the failing song: coarse points track the recording 1:1, refined downbeats land on onset peaks at 3.3x background energy.
 
 ### Added
+- **Unmapped-percussion capture now records velocities alongside times.** Both drum converters' opt-in `out_unmapped` reporting (`lib/midi_import.py` `convert_drum_track_from_midi`, `lib/gp2rs.py` `convert_drum_track_to_drumtab`) gain an index-aligned `velocities` list next to `times`, carrying each dropped note's real dynamics (MIDI velocity verbatim; GP velocity with the same 1–127 gate as mapped hits, falling back to the 100 import default). This lets a hand-mapping UI (the editor's unmapped-notes dialog) restore mapped notes at their source dynamics instead of flattening everything to `v:100`. The GP path's chronological sort now reorders times and velocities in lockstep so multi-voice measures can't silently reassign dynamics. Additive — callers that ignore the new key are unaffected. Tests: `tests/test_midi_import_drums.py`, `tests/test_gp2rs_drums.py`.
 - **Handedness (left-handed) is now a first-class choice in the instrument selector — and surfaced during onboarding.** Left-handed players could already mirror the highway, but only via a buried Settings toggle they had to find *after* setup — so a lefty hit the tour, the tuner and calibration all right-handed first. The v3 instrument badge popover now has a **Handedness: Right / Left** row alongside Instrument / Strings / Tuning (all player-orientation choices), writing the same `lefty` preference (`highway.setLefty` when a live highway exists, else the `lefty` localStorage key it reads on init; the Settings checkbox stays in sync). The first-run tour's "Choose your instrument" step — which runs **before** the tuner/audio-calibration steps — now calls it out so lefties flip it up front. Frontend-only, additive: `static/v3/badges.js`, `static/v3/onboarding-tour.js`. Tests: `tests/js/badges_handedness.test.js`.
 - **"Colorblind (deuteranope)" highway string-color preset.** Adds a one-click preset to the shared "Highway String Colors" picker, sitting next to the existing Okabe–Ito "Colorblind-friendly" preset — contributed by a deuteranopic player who found the Okabe–Ito set still hard to separate. It retunes the six main strings (red / yellow-green / blue / orange / teal / deep-purple) and keeps that set's 7/8-string colors, and applies to **both** the 2D and 3D highways via the shared picker. Frontend-only, additive: `static/app.js` (`HWC_PRESETS`).
 - **`lib/gp_autosync.py`: piecewise time-warp helpers + a working `refine_sync()`.** `auto_sync()` has always computed per-bar sync points (DTW), but consumers could only apply the scalar bar-1 `audio_offset`, so any tempo difference between the recording and the tab's authored tempo accumulated audibly over the song. New librosa-free helpers expose the full mapping: `bar_start_times(gp_path)` (per-bar score times on the same axis as the sync points — GPIF bar-resolution map for `.gp`/`.gpx`, per-tick integration for GP3/4/5), `build_warp_anchors(points, bar_starts)` (strictly-monotonic `(score, audio)` anchor pairs), `warp_time(t, anchors)` (piecewise-linear map with edge-slope extrapolation for count-ins/tails), `warp_song_times(song, warp)` (retimes a `lib.song.Song` in place: notes + sustains, chords, beats, sections, anchors, handshapes, per-phrase difficulty levels, tone changes, tempo overrides), and `gp_has_expandable_repeats(gp_path)` (detects GP3/4/5 repeat/volta/direction markup whose playback expansion the as-written sync points cannot map — callers fall back to offset-only sync). Also implements `refine_sync()`, which the editor plugin's refine-sync endpoint has imported since the snapshot but which never existed in core (the Refine button 500'd): it densifies the coarse DTW points to every Nth bar and re-times each with a local onset phase sweep (sweep radius clamped under half a beat so periodic material can't lock a full beat off; short scoring grid + median residual snap). Synthetic click-track validation: ~13ms mean / ~40ms max error from ±180ms coarse input across 117–123 BPM recordings of a 120 BPM tab. Tests: `tests/test_gp_autosync_warp.py`.

lib/gp2rs.py

@@ -1836,9 +1836,10 @@ def convert_drum_track_to_drumtab(
     drum strings. Unknown percussion sounds (cowbell, tambourine etc.) are
     skipped — round-tripping them would require teaching `lib/drums.py` first.
     Callers can pass an empty dict as ``out_unmapped`` to receive a per-MIDI
-    record of every skipped note (``{midi: {"count": int, "times": [...]}}``,
-    times capped at 100 samples per note) so they can surface a warning or
-    offer a manual mapping UI.
+    record of every skipped note (``{midi: {"count": int, "times": [...],
+    "velocities": [...]}}``, times/velocities index-aligned and capped at
+    100 samples per note — velocities carry the source notes' real dynamics)
+    so they can surface a warning or offer a manual mapping UI.
 
     Honours GP repeat brackets and D.S./D.C./Coda/Fine jumps when
     ``expand_repeats`` is true — same `_build_playback_schedule` machinery
@@ -1894,10 +1895,18 @@ def convert_drum_track_to_drumtab(
                             # NB: do NOT shadow the outer `entry` loop
                             # variable from `for entry in schedule:`.
                             unmapped_rec = out_unmapped.setdefault(
-                                int(midi_note), {"count": 0, "times": []})
+                                int(midi_note),
+                                {"count": 0, "times": [], "velocities": []})
                             unmapped_rec["count"] += 1
                             if len(unmapped_rec["times"]) < 100:
                                 unmapped_rec["times"].append(round(t, 3))
+                                # Index-aligned with times: the note's real
+                                # dynamics (same 1-127 gate as mapped hits,
+                                # falling back to the 100 import default) so
+                                # a hand-mapping UI doesn't flatten them.
+                                _uv = int(getattr(note, "velocity", 0) or 0)
+                                unmapped_rec["velocities"].append(
+                                    _uv if 1 <= _uv <= 127 else 100)
                         continue
 
                     hit: dict = {"t": round(t, 3), "p": piece}
@@ -1946,9 +1955,17 @@ def convert_drum_track_to_drumtab(
     # Times for unmapped notes were collected in beat-iteration order;
     # multi-voice measures can produce out-of-order beats, so sort each
     # entry's `times` list chronologically before returning to the caller.
+    # Velocities are index-aligned with times, so they must sort in
+    # LOCKSTEP — sorting times alone would silently reassign dynamics.
     if out_unmapped is not None:
         for _rec in out_unmapped.values():
-            _rec["times"].sort()
+            _vels = _rec.get("velocities")
+            if _vels and len(_vels) == len(_rec["times"]):
+                _pairs = sorted(zip(_rec["times"], _vels))
+                _rec["times"] = [p[0] for p in _pairs]
+                _rec["velocities"] = [p[1] for p in _pairs]
+            else:
+                _rec["times"].sort()
 
     return {
         "version": drums_mod.SCHEMA_VERSION,

lib/midi_import.py

@@ -486,10 +486,12 @@ def convert_drum_track_from_midi(
 
     Callers can pass an empty dict as ``out_unmapped`` to receive a
     per-MIDI record of every channel-9 note_on that didn't resolve to a
-    piece-id (``{midi: {"count": int, "times": [float, ...]}}``, times
-    capped at 100 samples per note). The default path skips this
-    capture entirely so MIDIs heavy with cowbell/tambourine/etc. take
-    no extra work.
+    piece-id (``{midi: {"count": int, "times": [float, ...],
+    "velocities": [int, ...]}}``, times/velocities index-aligned and
+    capped at 100 samples per note — velocities carry the source notes'
+    real dynamics so a hand-mapping UI doesn't have to flatten them to a
+    default). The default path skips this capture entirely so MIDIs
+    heavy with cowbell/tambourine/etc. take no extra work.
     """
     offset = float(audio_offset)
     if not math.isfinite(offset):
@@ -527,10 +529,13 @@ def convert_drum_track_from_midi(
                     continue
                 t = tick_to_seconds(abs_tick) + offset
                 entry = out_unmapped.setdefault(
-                    midi_note, {"count": 0, "times": []})
+                    midi_note, {"count": 0, "times": [], "velocities": []})
                 entry["count"] += 1
                 if len(entry["times"]) < 100:
                     entry["times"].append(round(t, 3))
+                    # Index-aligned with times: the note's real dynamics,
+                    # so hand-mapping doesn't flatten everything to 100.
+                    entry["velocities"].append(int(msg.velocity))
                 continue
             # Mapped note: compute t once for the raw entry.
             t = tick_to_seconds(abs_tick) + offset

tests/test_gp2rs_drums.py

@@ -223,15 +223,15 @@ def test_unmapped_percussion_silently_skipped(monkeypatch):
 
 def test_unmapped_percussion_reported_via_out_unmapped(monkeypatch):
     """Opting in via out_unmapped records the dropped MIDI notes (count +
-    times) so a caller can surface a warning / mapping UI."""
+    times + velocities) so a caller can surface a warning / mapping UI."""
     _setup(monkeypatch)
     track = _fake_track(
         string_midis=[56, 36, 54],
         beats=[
-            (0.0, [_fake_note(string_idx=1)]),   # cowbell — drop
-            (1.0, [_fake_note(string_idx=2)]),   # kick — keep
-            (1.5, [_fake_note(string_idx=3)]),   # tambourine — drop
-            (2.0, [_fake_note(string_idx=1)]),   # cowbell again — drop
+            (0.0, [_fake_note(string_idx=1, velocity=88)]),  # cowbell — drop
+            (1.0, [_fake_note(string_idx=2)]),               # kick — keep
+            (1.5, [_fake_note(string_idx=3, velocity=25)]),  # tambourine — drop
+            (2.0, [_fake_note(string_idx=1, velocity=44)]),  # cowbell again — drop
         ],
     )
     song = SimpleNamespace(tracks=[track])
@@ -247,6 +247,44 @@ def test_unmapped_percussion_reported_via_out_unmapped(monkeypatch):
     # Times are captured (rounded to 3 dp).
     assert unmapped[56]["times"] == [0.0, 2.0]
     assert unmapped[54]["times"] == [1.5]
+    # Velocities ride index-aligned with times — the mapping UI can carry
+    # the source dynamics through instead of flattening to a default.
+    assert unmapped[56]["velocities"] == [88, 44]
+    assert unmapped[54]["velocities"] == [25]
+
+
+def test_unmapped_velocities_sort_in_lockstep_with_times(monkeypatch):
+    """Multi-voice measures can capture times out of order; the final sort
+    must reorder velocities WITH their times, not leave them behind."""
+    _setup(monkeypatch)
+    track = _fake_track(
+        string_midis=[56],
+        beats=[
+            # Deliberately reversed chronology within the measure.
+            (2.0, [_fake_note(string_idx=1, velocity=44)]),
+            (0.0, [_fake_note(string_idx=1, velocity=88)]),
+        ],
+    )
+    song = SimpleNamespace(tracks=[track])
+    unmapped: dict[int, dict] = {}
+    gp2rs.convert_drum_track_to_drumtab(song, 0, out_unmapped=unmapped)
+    assert unmapped[56]["times"] == [0.0, 2.0]
+    assert unmapped[56]["velocities"] == [88, 44], \
+        "velocity must follow its time through the sort"
+
+
+def test_unmapped_out_of_range_velocity_falls_back_to_default(monkeypatch):
+    """A corrupt/zero GP velocity records the 100 import default rather
+    than poisoning the aligned list."""
+    _setup(monkeypatch)
+    track = _fake_track(
+        string_midis=[56],
+        beats=[(0.0, [_fake_note(string_idx=1, velocity=0)])],
+    )
+    song = SimpleNamespace(tracks=[track])
+    unmapped: dict[int, dict] = {}
+    gp2rs.convert_drum_track_to_drumtab(song, 0, out_unmapped=unmapped)
+    assert unmapped[56]["velocities"] == [100]
 
 
 def test_zero_velocity_omitted_from_wire(monkeypatch):

tests/test_midi_import_drums.py

@@ -185,18 +185,18 @@ def test_unmapped_drum_note_skipped(tmp_path):
 
 def test_unmapped_drum_note_reported_via_out_unmapped(tmp_path):
     """Opting in via out_unmapped records the dropped MIDI notes (count +
-    times) so a caller can surface a warning / mapping UI."""
+    times + velocities) so a caller can surface a warning / mapping UI."""
     mid = mido.MidiFile(type=1, ticks_per_beat=480)
     track = mido.MidiTrack()
     mid.tracks.append(track)
     track.append(mido.MetaMessage("set_tempo", tempo=500000, time=0))
-    track.append(mido.Message("note_on",  channel=9, note=56, velocity=100, time=0))    # cowbell — drop
+    track.append(mido.Message("note_on",  channel=9, note=56, velocity=88,  time=0))    # cowbell — drop
     track.append(mido.Message("note_off", channel=9, note=56, velocity=0,   time=240))
     track.append(mido.Message("note_on",  channel=9, note=36, velocity=100, time=0))    # kick — keep
     track.append(mido.Message("note_off", channel=9, note=36, velocity=0,   time=240))
-    track.append(mido.Message("note_on",  channel=9, note=54, velocity=100, time=0))    # tambourine — drop
+    track.append(mido.Message("note_on",  channel=9, note=54, velocity=25,  time=0))    # tambourine — drop
     track.append(mido.Message("note_off", channel=9, note=54, velocity=0,   time=240))
-    track.append(mido.Message("note_on",  channel=9, note=56, velocity=100, time=0))    # cowbell again — drop
+    track.append(mido.Message("note_on",  channel=9, note=56, velocity=44,  time=0))    # cowbell again — drop
     track.append(mido.Message("note_off", channel=9, note=56, velocity=0,   time=240))
 
     unmapped: dict[int, dict] = {}
@@ -209,6 +209,10 @@ def test_unmapped_drum_note_reported_via_out_unmapped(tmp_path):
     # Each unmapped MIDI carries the times at which it fired (rounded 3 dp).
     assert all(isinstance(t, float) for t in unmapped[56]["times"])
     assert len(unmapped[56]["times"]) == 2
+    # Velocities ride index-aligned with times — the mapping UI can carry
+    # the source dynamics through instead of flattening to a default.
+    assert unmapped[56]["velocities"] == [88, 44]
+    assert unmapped[54]["velocities"] == [25]
 
 
 def test_non_channel9_events_ignored(tmp_path):