Thu Sep 29, 2022 7:20 am
Yes, you could set up a button in Bitfocus Companion to send commands to multiple ATEM switchers. Note that Companion also has a web interface with on-screen buttons, so you can use it without a Stream Deck if you don't need the hardware control surface.
If you are asking about the built-in ATEM macros, those macros are executed internally by the switcher, so any actions performed by the macro are limited to the switcher the macro is running on.