Recording in dvs7 Ultimate

I have the dvs7ultimate and the U-Mix44. When trying to record I find two rec buttons in the programme. Why would I need two?
Second: when pressing record I can record whats playing but when I use the crossfader on my mixingboard, (not the one in mixvibes,but my physical mixer) like when scratching, it records the sound like I doesnt use the crossfader. You know, it sounds like a scratch without the cutting. Everything else works fine so my setup should be fine. Do I really need a second PC to record?? In so case what program do you recomend for recording?
My mixer is an American audio dx1400dst
Second: when pressing record I can record whats playing but when I use the crossfader on my mixingboard, (not the one in mixvibes,but my physical mixer) like when scratching, it records the sound like I doesnt use the crossfader. You know, it sounds like a scratch without the cutting. Everything else works fine so my setup should be fine. Do I really need a second PC to record?? In so case what program do you recomend for recording?
My mixer is an American audio dx1400dst