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The _masterTicks++ counter fell behind when Tone.Clock callbacks were delayed by GC pauses, UI interactions, or tab throttling. The counter never recovered, causing cumulative drift between sequencers. Now ticks are derived from the callback's time parameter (which comes from AudioContext.currentTime — hardware clock, always precise): ticks = Math.round((time - startTime) * MASTER_TICK_RATE) If a callback is delayed by 50ms, the time is still correct and ticks jump ahead to the right value. No accumulation, no drift, self-healing. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>