So maybe I didn't phrase my question right.. but what I'd like to do is control the volume of each instrument in BIAB (real tracks: bass, piano, drums only) through my mixer. I tried plugging in the M-Audio Fast Track Ultra and using that as the default system output. When I go into Audio Midi Setup, I see the M-Audio listed along with its 8 channels out... HOWEVER, I don't seem to be able to figure out how to feed those separate tracks from BIAB into the M-Audio Fast Track Ultra. I'm not sure I understand how BIAB sends out the audio from real tracks.
So, here's the stuff I've got... if someone knows how I can send my Bass, Piano and Drums from BIAB into my external mixer, either the Behringer 8 track or the M-Audio Fast Track, I would be into it. Oh, I've also got Logic Express 8 in there too that I could use.

THANKS!