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55 lines
3.4 KiB
Markdown
55 lines
3.4 KiB
Markdown
# Rivet 0.2 implementation plan
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## Musical intent
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Develop a producer's own motif through audible choices about recognition, space,
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contrast, and return. Offer three distinct compositional proposals rather than
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three randomly shifted versions. Emotional interpretation stays with the producer.
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## Engine
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- Keep an exact opening quotation. Build subsequent two-bar sections as statement,
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answer, departure, and return (four-bar phrases use statement and return).
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- Add tasks Develop, Answer, Make space, and Return. Generate a deterministic pool
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using rhythmic displacement, fragmentation, call/response, sparse subtraction,
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a later register peak, changed endings, and harmonic returns; remove duplicates
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and choose three candidates by task fit and musical distance. Return fewer if
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locks make three distinct outcomes impossible.
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- Preserve groove and contour independently. Per-note locks protect pitch, rhythm,
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or every attribute. Locked events survive subtraction; rhythm locks keep exact
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timing and duration. Global constraints and locks take precedence over transforms.
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- Optional harmony consists of bounded time regions with pitch-class masks and
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bass pitch. Accept polyphonic MIDI without claiming chord-root detection. Also
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provide editable per-bar chord progressions. Guide metrically strong notes and
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ending targets using the actual harmony at that time. Open endings prefer an
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available scale tone outside the ending chord; closed endings use chord tones.
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- Candidate generation changes note count, spacing, duration, and articulation
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when constraints allow. Preserve recognizable fragments; avoid overlaps and
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clipping MIDI values. Keep generated notes within two-bar section boundaries so
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sections can be combined safely.
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## Producer workflow
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Import motif -> choose identity/locks -> optionally import or enter harmony ->
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choose task -> audition alternatives -> pin two-bar sections -> export combined
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MIDI or accept a complete candidate. Retain accepted work during regeneration.
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Pins survive changes to task and seed, and clear when source or phrase length
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changes. Pinned material overrides regenerated sections. Reject unsafe seams
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rather than silently truncate a sustained note.
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## Audition
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Keep the internal voice and add a MIDI output mode. Preview is explicitly started,
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optionally loops, and switches pending selections at the next two-bar boundary or
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current clip end. Stop, replacement, mode changes, reset, and state restoration
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release emitted notes. Host transport start never auto-starts audition. All clips,
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queues, scheduling, and MIDI event emission remain bounded and allocation-free
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on the audio thread. Validate FL Studio routing manually; retain MIDI file export
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as the reliable commit path. Native OS MIDI drag-out is outside this release.
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## Compatibility and verification
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Write state version 2; migrate version-1 JSON and host fields with serde defaults,
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retain legacy strategy names for old candidates, and keep the persisted host field
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identifier. New controls/harmony/pins/audition choices persist. Test timing, locks,
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contour, harmonic targets, candidate diversity, section composition, migration,
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loop boundaries, sample-accurate note events, queued switches, and RT allocation.
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Run existing core/ABI tests and Clippy, render the updated editor, and package
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Windows CLAP plus Linux CLAP/standalone. Do not claim Devath-derived algorithms or
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FL Studio validation without direct evidence.
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