Control Mixout Channels with LR faders

So I’m working with a QU 32 and I have my LR as the main loudspeakers, then mixouts for the floor audience speakers, subs, and stage monitors.

Basically, mics are loudest through the LR channel and stage monitors, and music is loudest through the audience speakers, but there is some level of both through all of them. I’m wanting to be able to control a fader, say Ch 10 on LR and have it also control Ch 10 on my mixouts relative to where I set them on each mixout.

Set channel 10 in your mix to “Post Fader”. Select Mix 10, hold the Pre Fade button down at the far left, and toggle the Sel key on channel 10 so it’s not lit (post fader).