Newbie running MG3 via Reaper. At some point I started getting this message. I’m on M2 Mac Mini on Sequoia.
When I drill into settings, I get this:
In Reaper change the track Input to MONO (Input 1) and the message will go away.
I’d suggest changing “Ask DAW to give it 8 inputs” to “ask for one input” … I’m assuming you’re not using the hex tracker since you didn’t mention it…