Minifreak V only as a controller interface for Minifreak?

I’m going crazy here, because it feels like this should be easy to do, but I cannot seem to get it right.
I have my Minifreak connected to my audio interface using a standard jack cable.
I can hear it in GarageBand when I turn on monitoring.

I want to start Minifreak V and use it ONLY as an interface to control my Minifreak, but I’ve tried multiple things and it always produces sound. I don’t want to hear any sound coming out of Minifreak V.

Am I missing a setting or something?

Thanks in advance.