I am working in a church setting and using 3 stage boxes. For location of the box and convenience, is it possible to send Aux Mixes to the 3rd box? I can see the 3rd box in the remote setup, however cant seem to get it to work. I was going to attempt to assign the 3rd box to the channels 41-48. If this is NOT possible please tell me, so I can figure out another solution.