Tim, I've given up on Bandstand myself but have you tried running it with Composer via virtual cables (Midi Yoke or Maple Midi)? I can't remember if I ever got this to work. I think I did succeed in using the Bandstand VST version in Hermann Seib's standalone VST host and then Midi Maple to Composer. There are discussions somewhere in this forum about Seib's VST Host and about virtual cables in case these are new to you. These items are all free downloads so you have nothing to lose but time. (In my case, that was countless hours of trial and error.)

Susan