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Engineering a Browser-Based Step Sequencer: State, Timing, and Edge Cases

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A technical deep-dive examines the engineering challenges behind building browser-based step sequencer interfaces, focusing on the data structures and logic rather than the musician's experience. At its core, every step sequencer relies on a two-dimensional boolean array tracking which sounds fire at which steps, alongside tempo, swing, and accent values. A common pitfall is using setInterval for playback timing, which breaks due to browser timer throttling, mid-bar tempo changes, and sample underruns — each requiring specific workarounds like lookahead scheduling. The article also highlights that limiting a sequencer to six to twelve tracks keeps the grid usable on touch devices and prevents interface clutter. These design patterns — fixed-size state arrays, a single source of truth for transport, and accessible grid layouts — apply broadly to any UI built around a discrete timeline.

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