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I use Mac Logic Pro as my soft synth interface to BIAB. Consequently, I can assign any soft instrument to any track. I believe that any AU instrument that Logic recognizes can be used in this manner. Using the instructions provided in the tutorial you mentioned above should work for you. They did for me.



I've been able to get BIAB to use a Core MIDI IAC Bus (or the BIAB Virtual Output) to play BIAB through Bandstand (despite the crashing issue with Snow Leopard). And I just upgraded Garritan Personal Orchestra to version 4 with the Aria player, and it looks like BIAB will work over an IAC Bus with Aria just fine. So I can use Bandstand as my software synth (putting up with crashes, or uninstalling Snow Leopard.) Or I can use GPO/Aria -- not very convenient, since BIAB won't send program changes to GPO/Aria (unless I'm missing something), so every time I try a new BIAB style I've got to manually change GPO patches to load new instruments.

But you say you're using Logic as a software synth, assigning a variety of AU software instruments to individual Logic tracks. Could you elaborate? I've poured over PG's sketchy instructions (http://www.pgmusic.com/tutorial_bbm_nosound.htm, section on INTER-APPLICATION COMMUNICATION) but I haven't gotten that to work. I use Logic all the time with a variety of AU software instruments (Apple's, Bandstand, Garritan's and others) to play back MIDI files I've created in BIAB and imported into Logic. But I haven't been able to use Logic as a "live" playback engine for BIAB in real time -- to tell Logic over IAC to play BIAB's six or seven tracks simultaneously through separate Logic tracks assigned to different AU instrument sounds. Is that what you've got going? What am I missing here?