Pre listening to traktor

I thought I would upgrade to ddj sx2. Now I cannot cue my tracks as the master mix comes through the headphones socket whether I want it to or not. Frustrated and well peed off with this. May be selling this machine if I cannot get a solution to my problem. I haven't got time to messing about with this I have had to play 4 functions without being able to cue up my tracks properly. Smh