An example of how to access microphone data and HTML5 Audio API sound analysis capabilities in a simple crossbrowser manner. It only works on recent versions firefox and chrome (maybe safari, I haven't checked it).
You can check full source code here (no processingjs, only javascript, using requestAnimationFrame instead of relying only on setTimeOut as processingjs does):
http://414c45.net/blog/canvaslab-i-audioapi
And you can try it that way here:
http://414c45.net/canvaslab/canvas-audio/
Oh, that naughty sketch! Please let us know what the issue is below.
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