All of a sudden I can't adjust mix volume on each track

Elektron Gear Digitone/Digitone Keys
#1

All of sudden, it seems I can’t adjust the mix volume on each track using the Level / Data knob.

Did I accidentally switch something on that stops this working?

All tracks just play at full volume.

The Master volume knob works fine, but I can’t change individual levels.

#2

OK, this looks like it was a bug. FIXED.
I just hit the AMP button a couple of times and it went back to normal behaviour.
Thought I’d flag here incase someone runs into the same issue.