In a previous version of ST3 you could assign the 6 tracks to different outputs within ST3, then assign each output to a destination in your Audio Interface.
One nice thing about this is that it's easy to globally mute a drum track, for instance.
In the new version I love the flexibility we have with routing to separate channels, (and the increased tracks!) but we lost the ability to mute an output entirely. Instead I have to change the output routing to be None instead of the channel it was on. (and in a pinch I may not remember which channel it should be routed to later)
Am I missing something obvious here? If not, could I request a global mute for each of the tracks?