Yeah I think BB limits you on the number of tracks and IIRC you can;t add but one audio track....

So I would opt for using real band. Simply save and close the project in BB and then reopen it in real band. Midi tracks are opened and where it can, it will render the tracks using the real tracks.

Once that is finished loading, you are then free to add as many additional tracks from real band as you want or need.

I then take it a step further and export them into my Sonar DAW. That's where I do the work and the editing. However, much of that could be done in Real Band since it too is a DAW. I'm very familiar with Sonar and prefer to work in my comfort zone in Sonar.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.