I think I found the issue.
I connected the Audya4 to a Korg PA588 and use it as a master keyboard.
Iwas able to play the right hand sound from the PA588 and the Audya 4 was sensing the chords play in the keyboard, but still to full style play, only drums.
Went back to the Audya 4 and enable again accordion (keyboard control -> F5 accordion -> user 1/6 change to INACTIVE.
I have some confusion in this part. I can read INACTIVE, but I don't know if the accordion is inactive and selecting F5 will make it ACTIVE.
But any way everything is working now. I have no tested the configuration with a MIDI keyboard, but I guest that will work fine.

Thanks again Tonewheeldude for you advice.