How would I do this ?!
Total newb here. I want to set up my traktor s2 to go through my external mixer with deck A out the main and deck B out the main. How would I set this up with the hardware. And also what is the differance between the booth and main switch in the back ? 
Welcome to DJTT 
To go through an external mixer, simply plug the main RCA outs on the back of your S2 into one of the channels on your external mixer, then adjust the EQ to neutral and the gains to taste.
Someone can correct me if Iām wrong, but the booth output is designed as a monitor for the main signal that would be going out to the crowd through the PA system. Not entirely sure about this though, so play around with it!