oh I found out how. Thanks anyways guys. What I did is created a stereo track, then routed a send effect(only the send effect not the whole channel) to a bus or it could be a group channel. Next I pick out a reverb I want and apply it via insert not send. Then I mix the reverb so its 100% wet. The fader on the group/bus track now acts as a level control for the reverb and for the rest of the channels that I want to put th ereverb on, I control the amount with the send level slider on each track.