Traktor S2! Can't cue songs before mixing in HELP!!!!!

Open up your settings in Traktor pro.

Goto the mixer tab and click the box to show crossfader. exit settings, now on the bottom of your decks where the crossfader is on the right hand side there should be 3 knobs…1 for mix, 1 for volume and 1 for mic. The Cue volume here is independant of the cue volume on your board. Turn the cue volume up to max and then control the levels with the knob on your board.