Is it possible, while routing a signal out of the preamp out, to not have it also coming out of the master out? I know its easy to keep it out of the aux out, but not sure about the master out. My goal is to run separate outs to a master mixer so that I can run stereo backing tracks plus individual instruments, all individually controlled from the the 2nd mixer. I would use usb for the stereo backing tracks, no doubt coming out of the master and aux channels, but I don't want my live instrument tracks duplicated through the master.
ST has explained the situation that you've questioned.
Just a thought:
Depending on the mixer you're using: if it has preamp outs for all the channels you could eventually do it the other way round. By that I mean route everything through first through the second mixer and only the instruments that need to go through the T1 would need to be then taken from the preamp outs to the T1. You could mute those instruments on the mixer if you don't want them going into the analogue input. The T1 you would then send out through the Tonematch connection.
Does that make sense? It's just a quick thought as I'm basically only on a flying visit through the forum.