Audio setup on a Mac

Hi,
I'm sure this has been asked before but I can't seem to find the answer.
I just bought the Ion Discover DJ and I'm using the Mixvibes software. I have a Mac Mini and using the standard audio out on the Mac Mini to connect to my Home theater system. Is there a way to use USB headphones for pre-cuing with the software? I've used other DJ software where I could use USB headphones for pre-cuing but I haven't figure out if there's a way on the Cross software. I read up on Asio 4all but looks like that is a PC solution only, is there a Mac equivalent or is the only real solution to buy something like the Audio 2 DJ?
I'm sure this has been asked before but I can't seem to find the answer.
I just bought the Ion Discover DJ and I'm using the Mixvibes software. I have a Mac Mini and using the standard audio out on the Mac Mini to connect to my Home theater system. Is there a way to use USB headphones for pre-cuing with the software? I've used other DJ software where I could use USB headphones for pre-cuing but I haven't figure out if there's a way on the Cross software. I read up on Asio 4all but looks like that is a PC solution only, is there a Mac equivalent or is the only real solution to buy something like the Audio 2 DJ?