33bb08270d
- 808 bass: fixed note positions to beat 1.0 per bar (i-iv-i-V, 1.5 beat duration) - Chords: 4-note 7th voicings (Am7, F7, C7, G7) instead of 2-note intervals - Lead: constrained to 8-semitone range, pentatonic scale - Pad: arpeggiated eighth-notes instead of static 2-note drones - Ozone 12: fixed .vst3 filename paths in Calibrator - Delta-encoding: fixed cumulative timing drift in _build_midi_source() with CC events 298/298 tests pass.
65 lines
2.1 KiB
Markdown
65 lines
2.1 KiB
Markdown
# Spec: Fix Musical Coherence
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## Requirements
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### R1: Bass Pattern
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- 808 Bass MUST use i-iv-i-V pattern over 8 bars
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- Each chord gets 2 bars with 1 note on beat 1.0, duration 1.5 beats
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- Pitch sequence for Am: A1(33), D2(38), A1(33), E2(40)
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- Transposed by key difference from Am
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### R2: Lead Melody
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- Lead notes MUST NOT exceed 12 semitones between consecutive notes
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- Melody MUST use chord tones on strong beats (1 and 3)
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- Scale-based passing tones allowed on weak beats
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- Octave range constrained to ±6 semitones from root
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### R3: Chord Voicings
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- ChordEngine MUST produce 4-note voicings (root, 3rd, 5th, 7th)
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- Use m7 for minor chords, 7 for major chords
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- Voice leading keeps movement ≤4 semitones per voice
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- First chord respects requested inversion
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### R4: Pad Movement
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- Pad MUST have rhythmic movement (arpeggiated eighth-notes)
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- Cycle through chord notes in ascending order
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- Volume: 0.55 (prevents masking)
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- Duration per note: 0.5 beats (eighth note)
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### R5: Ozone 12
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- Master chain PluginDef MUST have correct .vst3 path
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- Filename field MUST match PLUGIN_REGISTRY entry exactly
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- No fallback to empty string path
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## Scenarios
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### S1: Bass timing verification
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Given: 8-bar section, key Am, bpm=95
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When: build_bass_track runs
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Then: First 4 notes at start positions 0.0, 8.0, 16.0, 24.0 (beats)
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And: durations all 1.5
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And: pitches 33, 38, 33, 40
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### S2: Lead range constraint
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Given: 4-bar hook motif in Am
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When: build_motif(style="hook") runs
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Then: all(n.pitch for n in motif) within 12 semitones of tonic
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And: max pitch - min pitch ≤ 12
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### S3: Chord voicing size
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Given: Emotion "romantic", key "Am", 8 bars
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When: engine.progression(bars=8) runs
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Then: Each voicing has len() == 4
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And: Notes include root, 3rd, 5th, 7th intervals
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### S4: Pad arpeggiation
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Given: 8-bar section, Am key
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When: build_pad_track runs
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Then: Clip has >24 MIDI notes (arpeggiated, not 3 sustained)
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And: Each note duration ≤ 0.5 beats
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### S5: Ozone vst3 path
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Given: SongDefinition with master_plugins after Calibrator.apply()
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When: RPPBuilder writes master FXCHAIN
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Then: VST element filename field is "Ozone 12 Equalizer.vst3"
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