Thanks for the feedback, I'll look into this a little bit further. My interface (iRig HD2) doesn't really have a control panel, it just shows up as an input/output device in "System Preferences" on the Mac and gets configured from there.

Given the responses I've seen so far, I wonder if I'm trying to make BIAB do something it's not supposed to? I'm a new user so it really wouldn't surprise me. Based on what I've read so far it looks like the workflow should be

1. Author the backing track in BIAB.
2. Publish to audio file (mp3, wav, whatever...).
3. Import into DAW.
4. Jam and Record.

Is that what most folks are doing?