John,
Thank you for testing and trove of interesting info!
Reading and re-reading. Many things to explore and learn.

I had better luck with a couple of other styles from my vArranger software in BIAB. I am getting closer to grasping workflow. Unfortunately Real band is a no go for me. I tried it several times (oh, believe me , I did) It just does not sit well with me. BIAB should do this just right.

I am not going for "particular style" from BIAB with this. The style and chords are more or less complete in my vArranger program. With BIAB I am looking to substitute 2-3 tracks for Real Tracks or double them up MIDI + RT if it sounds interesting. It is a bit awkward, because of mixup in the channels, but it is much more convenient than anything else. (Style picker, fast re-generations etc.)

P.S. I believe Mario proposed opening mixer to 16 channels... It would be so much more convenient to have it all laid out in a mixer tracks with clearly defined what is playing in what track. Real track or Midi or both.

Will report how it goes.

Thank you!