On GLD and on DLive, you are able to select an aux mix as a Mix Ext In source on a group. Useful for taking the board mix, adding delay and send in it to a group with audience mics so they are in time and process that for a stream mix. Or for sending your drum and instrument groups to an aux and bringing that together into a band group so you can sidechain dyn8 for dip a specific frequency out triggered by the Vocal group.
I found that it today SQ doesn’t let me do that but the GLD and of course DLive will. I would love to add this feature.