You're welcome Josh, here's a nice link I've just found about:

Midi.js (http://mudcu.be/midi-js/): a library for midi using webaudio api, making this demo possible: http://mudcu.be/piano/

I've found about it in this video http://www.youtube.com/watch?v=8yfCQtx_nIE, did I ever mention that Paul Irish is my hero?