Receder...I've been using BiaB with Cakewalk products for about 6 years. I started with MC4 and have moved to Sonar.

If you are writing electronica and styles that really need midi for driving a softsynth, then yeah, dragging or copying the midi tracks to Sonar is the way to go. Once you get the midi there, simply link it to a synth of your choosing.

If, however, you write music that is based on live players.... rock, country, bluegrass, etc.... then you need to use Real Band to render your Band in a Box project with midi tracks into all audio tracks in Real Band.

I compose in BB, transfer the project to RB, render all my tracks there to audio waves and export them into Sonar where I mix, add more of my own live tracks and polish the project.

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.