PitchWalker was classified as a generator but always consumed the
incoming pattern's triggers. Reclassify as a processor so it modifies
the pattern produced by an upstream generator (clonePattern instead of
createPattern). Add reEvalOnLoop flag on the Primitive base class; when
set, the sequencer re-evaluates the chain at each loop start so
stateful primitives produce evolving patterns across loops.
Four modules that build on the Layer 0 foundation:
- primitive.js: base class with category system (generator/processor/
timing/converter), param schema validation, boundary enforcement
(clamp/wrap/scaled), symbolic process() interface, state management
for freeze, and applyBoundary() utility for delta control
- clock.js: AudioContext lookahead scheduling (25ms interval, 100ms
window) replacing setTimeout arpeggiator. Reads pattern descriptions
for per-step swing (timeOffset) and ratchet (subdivisions). Emits
seq.noteOn/noteOff/step/loopStart via event bus.
- projection.js: composable transform chain with 5 transforms
(VelocityCurve, GateThreshold, RangeMap, OctaveFolder, StutterMap)
and 3 presets (expressive, percussive, fullRange). Pitch quantization
deliberately excluded (handled by Interval Lock primitive).
- step-viz.js: Canvas2D circular step visualizer with even angular
spacing for any step count. Pitch→radius, velocity→node size,
accent→color. 60fps-friendly with pre-allocated coordinate buffers.
Tap interaction for step toggling.
