The demo is a granular synthesiser with multi-touch support which uses Web Audio API for sound sampling and Processing.js for drawing and interactivity.
Runs on: Chrome, Chrome iOS, Safari, Safari iOS, Firefox
Libraries used:
Web Audio API : http://www.w3.org/TR/webaudio/
Processing.js : http://processingjs.org/
jQuery Knob : http://anthonyterrien.com/knob/