Hi,
I've actually got mine set up with a Korg PA800, I don't have trouble muting the channels via my keyboard.
You're trying to do yours thru sys ex?
I'm not terribly familiar with sys ex messages, but I don't think the hex you've typed in is correct.

If I get a chance , I'll try & have a look at it later today. Not sure if I'll be of much help though.

best wishes
Rikki

[QUOTE]Originally posted by getsmartnow:
[B]
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best wishes
Rikki 🧸

Korg PA5X 88 note
SX900
Band in a Box 2022