I have a GLD 80 with ME1 as personal monitoring. On ip8 (acoustic guitar) when the channel is soloed it can be heard and volume controlled. When solo is removed, it is no longer heard and another channel ip13 come through the channel. I’ve checked routing in the ME1 and GLD and all seems to be set correctly.
We had this issue this morning. We figured it out… the same channel was in a group elsewhere that was muted. There was a little triangle on the left showing the level it’s at in the other group, but that doesn’t mean it’s not muted.
Not sure if you still needed an answer but there you go!