Reply to traktor problem

Hey guys, I just bought a s4 today and ive been trying to set it up and ive been running into a couple problems. For some reason the volume levers and crossfader does not work, even if i if lower everything i can still hear music playing, same with the crossfader.

the other problem is I cant hear music coming out of my headphones. The first time I started traktor it worked normal but since then it has not worked.

last prob is that i cant hear my second deck even though there is a song playing and everything is turned up.

If anyone could help me with this I would be extremely grateful.