QS8 is a monitor control, a talkback module, a cuemixer and a summing amp in one and the same box.
As a monitor controller, the QS8 has a passive signal path, a click potmeter and outputs for alternative monitors. Stereo cue input and Aux 3 input have separate volume controls, so you can give the artist more of themselves (and they always want that, right?). At the same time, the Aux 3 eliminates any latency by feeding the input signal to the headphone mix. There is a talkback microphone with separate level control, and finally the QS8 can sum 4 stereo inputs to a balanced stereo output that you can record as a mix track.