Reply to Cheaper alternative to traktor audio 2?

I was having a problem getting my x session pro to work with traktor. I don't know if this is a problem with my external sound card but it wont play the song i want to play through my headphones. It plays both of them through my laptop speakers. Then i went into audio settings and selected my sound card, but now it plays both songs through my headphones. How do i play one song through my laptop speakers and the one i am cue'ing up through my headphones?

I heard this problem will be resolved if i replaced my usb external sound card with a traktor audio 2. Is this true? Are there any cheaper alternatives to the traktor audio 2?

Thanks