How can I route the audio signal from an internal source like iTunes through a self made Quartz Composition?

Hey,

 

I was trying to make a music visualizer with Quartz Composer and it works fine with the built-in microphone.

But is there any possibility to use the internal audio signal from a mp3 directly without any workarounds like soundflower or other audio routing software?

Or is it something you could not manage within a Quartz Composition?

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