If I want to build a spectrum visualizer of what's currently playing on my speakers (not the line in) what do I do?
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Download and install Wiretap Anywhere from Ambrosia Software.
Wiretap allows you to take any audio outputs from applications and route them to a virtual audio input which you can use in Quartz Composer, or any other OS X application that uses a hardware input.
Nick Haddad
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