Starting up... if nothing happens, perhaps you don't have webkitAudioContext? This is Chrome-only for now.

Drag knobs left and right:

This is a throwaway demo of a TB303-like bassline synthesizer I wrote over ten years ago, ported to the new webkitAudioContext API. I just hardcoded a pattern (see the source, but it's full of black magic). It wouldn't be too hard to make it editable for a proper little Chrome demo.