How can I easily record my mixies from my djm 700 or from my djm 850? I record them from master output with my audiocard but it's so bad because i have to link mixer and audiocard.

 

doesn't the djm850 have a built in usb interface?
so you can just plug a laptop in via usb, and record into a daw or something free like audacity

with the 700 i think there is a 2nd output for master (if not use the booth output), make sure the levels aren't too high and recording into your audiocard should sound fine