spec: Add HELD-NOTES.md proposing tie-based note duration#21
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Captures architectural decision to replace track-level playbackMode (oneshot/gate) with per-step ties in ParameterLock. This enables: - Notes sustaining across multiple steps - Per-note duration control (vs track-wide) - Consistent model with pitch/volume parameter locks - Expanded genre coverage (ambient, soul, ballads) Includes research from Elektron, Novation, Logic Pro, Bitwig, and mobile sequencer implementations.
Documents how TE handles note duration across their product range: - OP-Z/OP-XY: Most sophisticated (track defaults + step ties + step components) - OP-1: Lacks per-step duration (Field added Hold sequencer to address) - EP-133: No gate modes (users explicitly request this feature) - Pocket Operators: Per-step length on melodic models, one-shot on drums Key findings that validate our approach: - OP-Z's "hold start + press end" gesture matches our proposal exactly - OP-Z's "Pulse Hold" step component is equivalent to our tie - TE's implicit rule: drums=oneshot, synths=envelope+ties - EP-133 user feedback proves gate/sustain control is expected Also adds: - Updated interaction design with OP-Z gesture as primary - Future enhancements section (step components, drone mode, glide)
Removes speculative future enhancements section (drone mode, step components, portamento) to keep spec focused on the tie proposal. Adds comprehensive "Interactions with Roadmap Features" section analyzing how held notes interacts with other planned features: Positive interactions: - MIDI Export: Ties enable correct note duration export - Pattern Chaining: Independent, compose naturally - Scale Lock: Orthogonal (pitch vs duration) - Keyboard Shortcuts: Natural extension (arrow keys for ties) - Undo/Redo: No special handling needed Complex interactions requiring decisions: - Step Probability: Tied steps should be exempt from probability - Ratcheting: Mutually exclusive with ties (opposite concepts) - Beat-Quantized Changes: Apply immediately, affect next loop - Euclidean: Generates triggers only, ties applied manually - Quick Fill: Document per-variation behavior for ties Neutral: Velocity (already addressed), Sample Recording, Track Groups
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Captures architectural decision to replace track-level playbackMode
(oneshot/gate) with per-step ties in ParameterLock. This enables:
Includes research from Elektron, Novation, Logic Pro, Bitwig, and
mobile sequencer implementations.