Update: OK, figured it out. Comedy of errors. Wasn’t using post-fader, and had it set up for wrong mix group – basically, just needed to start over from the beginning. The goal was to have the PA guy do the audience mix on 4 mikes, and send that mix over to the TV board as a single mix where the TV audio guy could then optimize the audio. Doing the same on pre-recorded audio played from the booth – sending that as a single mix over to the TV audio. The other inputs are going to both boards independently. Anyway, once I got the post-fader mix working, the rest just fell into place.
Thanks for your patience. I’m a happy camper now 🙂