I Build the songs in RealBand.I don't use the so called "BB" tracks. Just plain tracks. My focus is having a consistent sound like a Real Band regardless of the song. I use an ESI Gigaport HD audio interface.It is 8 outputs, no inputs.
I assign tracks like this.
1. Drums
2. Kick
3. solos
4. horns
5. acoustic guitars
6. electric guitars
7. Piano
8. Organ
These 8 outs go to 8 ins on my Behringer xr16 mixer. The xr16 is just a box with 16 inputs, 4 aux outs and 2 main outs. It is controlled by software that connects via wifi.
The headphone out of the computer provides chords to my harmonizer. Not heard
One channel of the mixer is main vocals and two othere channels are harmony vocals.
I also use another track in RB with note data that, using a virtual midi cable, connects to QLite controller which is lighting software.I built a box that converts the lighting cues from usb to DMX512.
The mixer main outs go to my 3000 watt biamped pa. I use in ears out of the mixer.

John
ESI Gigaport HD+
Lenovo Turion II /4 Gig Ram/ Win7x64 be
15.6" Monitor
"The only Band is a Real Band"
www.wintertexaninfo.com/BANDS/JohnnyD.php