7d3a19ec35
Root cause: floor(elapsed * rateA) vs floor(elapsed * rateB) where rateB = 2*rateA doesn't maintain exact 2:1 ratio due to floating-point multiplication errors. This creates a beat/aliasing pattern where sequencers at 80 and 160 BPM periodically go in and out of phase. Fix: Master clock now uses an integer tick counter (_masterTicks++) instead of floating-point elapsed time. Sequencers derive steps via: stepIdx = floor(ticks / ticksPerStep) % numSteps where ticks is an integer — no floating-point accumulation possible. Also bumped master clock to 480 Hz for cleaner division at common BPMs: 80 BPM: 480*60/320 = 90 ticks/step (exact) 120 BPM: 480*60/480 = 60 ticks/step (exact) 160 BPM: 480*60/640 = 45 ticks/step (exact) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>