I have version 14 but I use 12, seems all new features are real track related, not sure I will upgrade anymore as only a few new super midi styles are added, all the new styles are real-tracks (as far as I can tell), I don't like 14 but maybe its not set up right, it defaults to real tracks.

I make music this way
Generate midi track
Tweek midi track
add audio last in pro-tools.

Even if I use straight up BiaB I export the midi.
Play it in midi software, where I can fine tune what I like. Once it is created it is exported, if the arrangement changes which it normally does I go back to Band in a box and change it. Rinse and repeat until it is done then add guitar parts last in Pro tools, or make a live video playing to the MIDI track. I am pretty sure what I am doing is more complicated that what the average user is doing.