Reply to Traktor Audio 10 and master volume

hey im using my apc40, xone 42, traktor audio 10 in traktor at the moment until i construct a good mapping in ableton. Currently I have Channel A linked to 3/4 on the audio 10 Channel B linked to 5/6 and so on. One problem I am having is getting the master volume to play out on my speakers.I have Main 1/2 OUT running to my speakers...What could possibly be the problem?

thank you!