well, I made sure garage band and the sounds were installed, and I can select sounds there in GB

Still, no ability to change sounds using the mixer and selecting midi patches...

tried changing outputs on the thru port (BIAB virtual versus appleDLS)..didn't fix (but of course lost the thru sound)

Tried changing MIDI driver from CoreMIDI to DLS synth...was able to change sounds in other banks (bass, piano), but lost the thru...

I am at a loss...

Still, I can just add my sounds as plugins and move forward, but I am still trying to understand why the midi from BIAB doesn't seem to go through the synth that GB uses....

Thanks all!