Great, and yes, the buttons are identical on all models. I am pretty sure Ketron are the best instruments for those with sight issues.

When it arrives use the Midi In (keyboard) port then, presuming you are splitting the controller as channel One upper and Two lower:

MENU -> F2 MIDI -> F6 CHANNEL RX ->
Upper 1
Lower 2
all others OFF then:
F9 Arranger Chords ->
Lower 1: 2
Lower 2: 2
all others OFF

and lastly press "SAVE" (under the cursor keypad)

Then go into Menu -> keyboard control -> F5 accordion -> user 1/6 (change to INACTIVE).


and then USER 5/10 'SAVE'

That should get you started although you may need to change the octaves for upper/lower. The latter instructions ensures good chord recognition.