Dude me too! Its super handy. Same with Soundflower, but I think I like Jack better... Plus I just discovered how to create an aggregate audio device in Core Audio and that also opened up a shit load of routing possibilities....pretty awesome.i recently discovered the niceness of the audio jack software for mac. not only does it support really low latencies, but you can route itunes to machines "external" inputs and sample stuff on the fly. totally changed my life