I haven’t used one with a SQ but I have used an Avantis connected to both an SD9 and an MGB and routed audio in between. The MGB was going of to al LV1 setup so given this I assume it would do everything you need it to.
No it doesn’t. I want to be able to for example use a user definable button to control a group of inputs gate on/off as a group but still want to be able to individually control them not have them ganged together.