I have a soundcard:lexicon alpha,numark mixtrack 2.problems with cue-ing. Help!

Hello guys, i bought a numark mixtrack 2 and a soundcard(lexicon alpha).My question is:"Can I use the cue option for my headphones and also play the music from the speakers with this soundcard, because my controller does not have a built in one?.Also if yes, what cables do i need to buy ?" On my work i have 2 midi speakers , and at home a home stereo system.For now im only capable of using my home stereo system with the speakers, using 2 RCA outputs from the soundcard to the inputs of the stereo.

It doesn't look like you can. You need four channels (2 x stereo outs), one stereo for master out, and one stereo for cue out.