Is this only in the Ajamsonic customized units or also true for factory units from Audya/Ketron? I'm not sure we are understanding each other.

Imagine this scenario...

If I select a "big band style" accompaniment "A", I would like a sax right hand lead voice. Then with my foot control (I'm an accordion player and do not have the hand freedom of a keyboard player) I change to arrangement "B" and want a trombone right hand lead voice. Then with my foot control I change to arrangement "C" and want strings for my right hand lead voice. And finally with my foot control I change to arrangement "D" and want a fuller right hand sound like a sax with harmony activated.

Are you saying the above is possible with a stock Audya unit?

Sorry to be so slow on the up-take here, but I'm not getting the answer yet.