Numark Mixtrack

Hey guys, I'm new to the forums so please keep the threats to a minimum haha ...anyways, I'm just starting to get into DJ'in with a laptop and just ordered a DJ i/O for the final piece. I have the Numark Mixtrack that I bought from a store and it has these two knobs in the middle. Their listed as "Cue Gain" and "Cue Mix"...can anyone tell me what those are for? Also, the "Manual Loop, IN, OUT, RELOOP" has puzzled me...I know how to loop in a track already but what is the manual loop for?

 

The manual loop is so that u can set your own loops on the fly instead of the standard (not sure if these numbers are exact but) 2 bar, 4 bar & 8 bar loops. The cue knob is so u can listen to your mix like if u are playing deck A u can setup ur Cue mix to where u can hear what's going on from Deck b without playing it on your main speakers, and the Cue gain is the Cue Volume. anytime u see the word gain it is just another word for volume.