I thought that could be the case, so I copied our Drummer’s mix settings and saved them over to the Acoustic monitor out (completely overwriting the settings he had… at least that’s what I understood to happen), and we still have the same issue. The only workaround I’ve thought of so far is to swap his mix with one of the empty ones (Mon out 11), and leaving his Mon out 6 as an empty output.
I’m more of a musician than a sound engineer… so some of these routing issues are a little foreign to me. But, based on what I’ve read in the manual and through these forums, I think I have everything routed as it should be. We’ve had a few random bugs in our system, so I may have to chalk this one up to something like that…