CDJ 850s have no lan port so that rules recordbox down to usb flash drives only - no hooking directly from pc Your options for using them with a computer are: -can use them with USB connection as midi/hid controllers in traktor,vdj,serato. When i looked at this path VDJ and serato scratch had hid compatibility but traktor only had midi (no HID) so i didn't pursue this much further besides setting up once to much around with -traditional DVS edit: update - just had a quick google - there was rumours that hid was coming for the 850s in traktor 2.6 but doesn't seem to have happened.