Every screen in the room needs the right thing on it - the main wall, the lobby, the stream, the confidence monitors. Routing and compositing is how the right picture lands on every screen at once, on one button, instead of a technician riding a dozen faders in the dark.Routing is deciding which source lands on which screen. Compositing is stacking those sources into a single look - a camera, lyrics keyed over it, a lower third, the right feed on each LED zone. On a broadcast switcher that's dozens of button presses. Here it's one snapshot, fired as a cue.
A single moment in the service is a lot of state: which camera is on program, what's keyed over it, which feed each LED zone is showing, what the confidence and stream buses carry. The switcher can hold all of that as a custom control - one recallable snapshot of the entire crosspoint.
The platform names that snapshot and hands it to the operator as one labeled button. Press it and the switcher re-routes every bus, arms the right keyers, and pushes the correct feed to each MiniME at once - the same instant the lights and lyrics fire. The MiniMEs matter here: each LED zone is its own independent mix, so the main wall, the side panels, and the lobby can each show something different, on purpose.