Soundflower from Cycling ’74, a small freeware utility allowing internal audio routing
under OS X, is available in Universal Binary for MacTel computers. Soundflower is similar to Jack, and while the latter has some more advanced features, I find Soundflower easier to use. They are both perfect for recording for example streaming audio.

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Alexander Refsum Jensenius is a music researcher and research musician living in Oslo, Norway.