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So IAC driver feeds to BBvia the coreMIDI, and how would you bounce that track?
It would be external, so I'm not seeing what purpose it hold, other than say practicing. I suppose you could export BB's as SMF and import in to you host, but that would defeat the purpose, or not . Depends on what the goal is I suppose.




Huh? You lost me there. As I understood the original question, he's got software synths he wants to use. Set up an IAC bus for each software synth. Then in BB, assign that MIDI output port/instrument (piano, bass, etc.) to the IAC bus that routes to the synth. That allows you to choose a high patch for that instrument, specific to the synth. Done that way, you can literally have a separate synth hosting each instrument, on a separate IAC bus.

As for input, just route your melody or Thru port to an IAC bus and then assign that bus to the midi input port.

That's not a practice thing; that allows you to have a full setup, with the best synth for the job for each instrument, all running on one mac every time. Route the synth audio outputs to a DAW. Put together a batch command to fire up your synths in order and then BB.

Myself, I route it through Logic first, then to my synth, that way I can capture all the midi events on-the-fly, instead of (as you pointed out) mucking with SMF files. The only reason I'd put the synth before the DAW is if the synth was going to contribute to the MIDI event stream.