Cleo59, Gary,
on which of the 2 midi Inputs you have connected the accordeon? The accordeon MUST be connected to the input IN2 (Keyb).
I can't image, that the SW for the Audya 76, Audya 4 and Audya 5 is different in the main routines - and the accordeon mode is one of the main routines - so I think it must be a setting topic - but you never know with Ketron devices.
What I can offer is to make some screenshots from my settings, this is all I can do.
I'm wondering why AJ is not giving some hints....
Joe