Mixer/Sound stystem help

Ok, So I just purchased Mixvibes Cross. Setup everything. Just downloaded the new version. All RCA cables are where there supposed to be and what not. I'm new to this whole timecoded thing and its really frustrating me. I have a few problems...lol.
1. When I plug my headphones into my mixer the quality is terrible, the gain levels are normal as are the bass, highs, and lows etc.. But when I plug my system into the Mixvibes vibes box it sounds great but it will play both decks simultaniously, meaning the Cross fader does nothing.... Im really confused and frustrated right now. Any help would be tight. Thanks.
A list of my equipment is in my profile.

1. When I plug my headphones into my mixer the quality is terrible, the gain levels are normal as are the bass, highs, and lows etc.. But when I plug my system into the Mixvibes vibes box it sounds great but it will play both decks simultaniously, meaning the Cross fader does nothing.... Im really confused and frustrated right now. Any help would be tight. Thanks.
A list of my equipment is in my profile.