I may have misunderstood the request. Do you mean that you would want the booth output to mute all output including the microphones? In that case, would it work to use the existing option to not route the microphones to the booth output?
I may have misunderstood the request. Do you mean that you would want the booth output to mute all output including the microphones? In that case, would it work to use the existing option to not route the microphones to the booth output?