
Could yu please explain what are you trying to achieve? Are you try to use the XDJ-700 stand alone (they are stand alone devices) or trying to use them with rekordbox performance mode or rekordbox export link mode? How are the XDJ-700 connected? LAN or USB. As you mentioned a USB Hub, is it a powered hub or not. Unpowered hubs may not have suddicient power from the USB bus and therefore wouldn't work.