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feat: generate bounded ascending and descending MIDI arpeggio patterns

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Johannes Findeisen 2026-11-06 00:42:33 +01:00
commit ea0b4ca3da
9 changed files with 89 additions and 5 deletions
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4
docs/COMPOSITION_WORKFLOWS.md
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@ -34,3 +34,7 @@ Edit/MIDI tools/Humanize applies timing variation up to 960 ticks and velocity v
## Phase 65 — Chord Construction
Edit/MIDI tools/Build chords accepts 1..8 unique nonzero semitone intervals, such as 4 7 for a major triad or 3 7 for minor. Originals remain; added notes copy timing, velocity and channel. Negative intervals support lower voicings. All source notes are processed, including hidden trimmed notes. Pitch overflow or capacity rejects the whole operation; existing unisons are not deduplicated.
## Phase 66 — Offline Arpeggio Generation
Edit/MIDI tools/Generate arpeggio replaces source notes with a written pattern. Equal-onset notes on the same channel form a chord lasting until its longest note end. The pattern cycles sorted pitches upward or downward, with the selected step and gate. Each step inherits its chosen note velocity/channel. All source notes, including hidden trimmed notes, participate. This is offline generation with undo, not a live arpeggiator or tempo-synced MIDI effect.

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docs/ROADMAP.md
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@ -1617,12 +1617,12 @@ Implemented: custom bounded chord intervals add independent notes with fresh IDs
Convert source note chords into bounded ascending/descending stepped patterns with gate controls, deterministic ordering and undo.
### Tasks and acceptance criteria
- [ ] Implement bounded C99 model/control APIs and accessible GUI commands.
- [ ] Preserve transactional errors, history, compatibility and callback safety.
- [ ] Verify the feature with automated model/GUI tests and document limitations.
- [x] Implement bounded C99 model/control APIs and accessible GUI commands.
- [x] Preserve transactional errors, history, compatibility and callback safety.
- [x] Verify the feature with automated model/GUI tests and document limitations.
### Implementation status
Planned.
Implemented: bounded offline ascending/descending arpeggio generation with equal-onset/channel chord grouping, step/gate controls and fresh note IDs. Core ordering/gate/capacity rollback and GUI generation/undo tests pass.
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