Last tip… Part Mutes are externally addressable via MIDI or USB. If this is something you feel you’d really like constant access to without menu diving and scrolling, a cheap USB pad bank could be programmed to send the codes, maybe even light up to show you Part status.

I haven’t done this myself, I tend to set things up in advance (never really have liked running an arranger old school style!), but I’m pretty sure it’s doable. Check the Midi implementation. You definitely want Part Mute, not Part Volume because turning the volume to zero still has the voice using polyphony even though not sounding…