I have a QU 16 and we are not getting any sound out through the main LR fader. I get signal in though any track or stereo track and can route it to a mix (in this case stero out through the d-snake to the monitor speakers), but not the main LR. The main is hardwired to the amp and EQ, and that is all working fine. I get hiss through the speakers. When I look at the screen I see the green bars rising on the input track but when I select the main track there is not signal going to the track, so no rising and falling green bars, even the lights too do not register signal. Any thoughts anyone!