The original version of MixEffect did not have support for controlling the app through a Stream Deck. Readers asked for the feature, and I delivered in the 1.0.2 release of MixEffect.
Learn more about using MixEffect with Companion and a Stream Deck here:
MixEffect Companion Profiles
To-date, I have made two MixEffect Companion Profiles for the ATEM Mini Pro/Pro ISO and the ATEM Mini Extreme/Extreme ISO.
MixEffect Labs 🟡 Gold Members get free access to these Companion profiles, a $20 value for each profile. If you want to purchase them individually, you can do so via Gumroad.