Thanks, Mac. It looks like I can separate and bounce tracks between the Melody and Soloist tracks, which helps a lot with what I'm trying to accomplish.

I've been using Cakewalk Sonar for MIDI processing. As you know some songs have a unique bass line, drum pattern or other distinctive feature. It would be helpful to be able to simply load those pre-recorded audio (MIDI) sequences into BiaB and build a background around them using BiaB's excellent sounds and styles.