Works fine for me on Chrome 13, OS X 10.6.7, however I do have Web Audio enabled in about:flags. Whether or not the Web Audio API's by-passing jsmad, I don't know.
Awesome! Good to know, I'll test it right now.
Edit: I cannot get it to work in Canary, even with Web Audio enabled. Hm...
Did you click the Relaunch Chrome button at the bottom of the about:flags page? I got it working with Chrome on OSX once I did that.