9dba156961
Problem: two sequencers at different BPMs (e.g. 80 and 160) would drift apart over time because each used an independent step counter (step++) that accumulated floating-point rounding errors. Fix: derive step/position from audio clock time (Tone.now()), not from an incrementing counter. Step = floor(elapsed * rate) % numSteps. This makes timing mathematically exact regardless of how long it runs. Also: - Sequencer note-off uses Tone.getContext().setTimeout() (audio-thread) instead of Tone.Transport.scheduleOnce() which needs Transport running - Clock runs at 2x rate for tighter step edge detection - PianoRoll uses same time-based position calculation Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>