I reckon there might be a few abandoned Zero4 mixers out there if not re-purposed or just sold on because of this fixable issue. You might have ran into this issue whilst trying out many various DJ or production antics that you can do with what is  a pretty versatile digital/analogue mixer.

These issues only occurs in full MIDI control mode and not analogue/digital or analogue/digital/Midi hybrid mode.

symptoms: If you found that the MIDI implementation is all messed up whilst in full MIDI mode...
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