Hi Patrick,
I really should connect my FR-3x to my Auda5... planned it a few months ago but had no time for it...
If it works with the original HD it could be different midi-settings in the Audya...
Which (Audya4) preset do you use ? General, Accordion 1 / 2 ??
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Greetings from East-Frisia ( Northern-Germany )
Korg PA5X Musikant, Fw. 1.4