I finally managed to get Talkback working! I have a mic on local 44 assigned as the source; the output is to a mono aux, which is sent to the ME-1s. (Noob mistake: not raising the fader in the aux so that I could be heard!)
My problem: I’m limited on local inputs on my GLD-80, so I’d really like to use a USB mic instead of a direct input. The source selection for Talkback shows USB as an option but, try as I might, I get nothing with a USB mic (headset) plugged into USB 1 or USB 2.
What am I doing wrong?