to clarify a bit, on each track, insert 2,3,up to 5 pre-fader aux sends routed to buses. Add 2,3,up to 5 stereo aux returns, solo safe, with inputs corresponding to the aux send you set up previously. Set outputs of each aux return to whatever hardware outputs you want to use. Now set up mixes for each return. You can now solo, mute or insert plug ins in the control room without interrupting or changing the mixes in the performance room. I;ve been using this sytem for 3 years now - no complaints.