Reply to Behringer NOX404 + Traktor Pro 2 HELP

Ok so I recently got the behringer nox404, and I use traktor pro 2 with it. My crossfader works fine and my volume faders, but when I turn my high, mid, and low knobs on my mixer, they don't move on traktor, therefore not changing the sound how I want. I believe this has to do with mapping and I have no clue how to link my mixers knobs to the virtual ones, please help.