Scarlett 2i2 Soundcard w/ XDJ-RX2

Hello,

I need help figuring out how to use my Scarlett 2i2 Soundcard with the XDJ-RX2. When I hook up the sound card, I do see Scarlett 2i2 as an output Audio option. The problem however is that I cannot mix in my headphones without the songs coming through my speakers. I've tried every output setting possible, but the music comes blasting through my speakers even when the volume is on 0 on the mixer. Any thoughts on how to set up would be great, but I'm thinking that 2i2 isn't the right sound card for my board and that I need a 4 channel instead?

Rane