You'd think that much of the basic arranger control would be simple MIDI commands if they are being used with MIDI accordions a lot... Most of those don't have fancy sys-ex capabilities.

The other thing I can suggest, Lee, is to get a foot controller for the Audya. I do most of my basic arranger control with my feet (to not interrupt my hands from playing), basic var and fill selection and breaks. They have a what, ten button input, don't they? You can do a LOT with ten buttons...