I’m sure you’re right. It was indeed a mono cable.

It never occurred to me that that could be the issue. Thanks!

Solved my own issue, sort of. The voice in question is in fact playing, but for reasons I don’t quite understand, I couldn’t hear that one sound the way I was set up. I was running the sound out of the headphone port (because I wanted the click for what I was doing) into a delay pedal, and then into...

I just acquired an RX7 that seems to work well except for one issue: one of the voices (46 - Ride Cymbal Edge) doesn't sound no matter what key I assign it to. I've reinitialized the voice and reset the whole RX7 a few times, and it hasn't helped. The weird thing is that I know this sound was workin...