An IDCA that will be all the other vocals. An IDCA for the individual’s mic only, the more ME control. For example - The IDCAs will be set up something like this. I set up Layers in MS using IDCAs so the user doesn’t see all of the channels available on the screen they see faders that control the different groupings.
I set up Mixing Station (MS) for a church for them to use it to control their IEM mixes.