Hi. I'm having a issue with trying to route my outputs to a summing mixer. When I create a bus going to output 3/4, 5/6, 7/8, they all show up but there is only the master fader that will control them all since the stereo fader is no longer in use. How can I do processing among all the outputs with one bus without having to do them individually? The master will not allow any fx to be placed on it. Thanks!