Reply to 3 questions

Hello guys!! Im a new Happy Owner of this amazing controller - regular version (not EGE), changed my S2 for this one and very very happy to work with it. But I have 3 question about:
1. The MASTER VOLUME knob - his hardware volume of soundcard (like S2) or only software volume through MIDI mapping?
2. The 4 Grey GAIN knobs for every channel - them hardware Gain or software?
3. and last - i played at club last evening and noticed that sound output of deck A in traktor is lower then output from deck B. Im using the autogain functions for each channel (blue led or orange led no matter), and im disabled the Gain comand for GAIN knobs (im using them for additional effects). Why it can be?

P.S.: the only one minus that i found it- the SHIFT button - the place of him in the layout and sharing of the same MIDI signal for both sides.

everything else work fine