Kevin,
I feel your pain buddy. I'm playing in a restaurant with a piano player... and here's what I did that worked:
I used "keyboard maestro." It's a keystroke recording program. I had that program watch me (record my keystrokes) while I maxed out the volume on the bass and drums, then I panned the bass way left, and the drums way right, then I hit "Save." I then created a keyboard shortcut for that macro.. THEN... I went through ALL of my fucking BIAB songs and repeated that macro and I altered ALL of my BIAB songs.
So, in the end, I changed the setting on ALL my BIAB songs to max out the volume on bass and drums, then pan that out.

NOW... and here's the fun part... I use a cable that splits the audio out on my mac into a separate TRS cable plug for left and right... so I then plug the left and right's into my mixer... so now I can control the volume of the bass and drums on the MIXER! Win! So, I leave the BIAB volume all the way up, and I set the volumes on my mixer. Those pesky congas, and everything else, pretty much stays the same volume. I mean, I still tweak a little here and there with the mixer, but it pretty much works. We keep the volume low and tasty and have a nice gig... for your sushi eating pleasure.

~Benny
www.bennytorres.com