Hi Wes,
Besides what Gary (information help us) and Andrew recommends, can you see the unintended accordion in your synth instrument panel? or just listens it? What instruments sound source do you use? Check if your VST/DXi or hardware syth instruments source is being properly initialized and it can accept program changes. Also see in Prefer/MIDI Options if the right columns related to Patch Changes are checked in order to BIAB can send program changes to synths. Hope it help.

Carlos