Dev builds NodeSeq, a browser music sequencer coded almost entirely by Claude Code
GuyInThe6kDollarSuit · reddit · 2026-10-13
A developer used Claude Code to write nearly all of NodeSeq, a free browser music sequencer (nodeseq.com) with no sign-up required.
How it works: instead of a timeline or piano roll, you wire nodes on a canvas. Drum, synth and bass nodes make sound; pulses travel along connections with fixed timing to create rhythms. Gate nodes add fills and arrangement, Mod nodes tweak other nodes' parameters on every firing. Node groups become performance pads, with scenes, song mode and live effects. All audio is synthesized via the Web Audio API — no samples. Tracks export as WAV, share as links, or publish to a community page.
Claude's contributions: evolved a single HTML file into modules with scheduler tests; unified live playback and offline WAV export into one code path; implemented WebAuthn sign-in and input sanitization; even produced the trailer by driving the real app frame-by-frame in a headless browser with offline audio rendering.
Lessons: tests on pure-logic code paid off most; asking Claude to explain timing bugs before fixing found root causes faster; small specific requests beat vague feature requests for audio work.
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