Hi Franconia,

Maybe this will help! If you have the capability to set the chord and bass on the same MIDI channel it will eliminate the bass note playing when the arranger is not playing.
However, this limits the versitility somewhat!

When using the Audya 4, I set my bass and chords on the accordion to channel "6" and in the Audya 4 in MIDI Rx. set left to channel "6" and the bass (F3) to off. "-"

Obviously, in the accordion setup, Autochord and Bass to Chord should be ON.

Don P