Reply to VMS2 problem

so i recently got a used vms2 off of ebay and the volume sliders, crossfader, and EQ knobs dont do anything. the weird thing is that i can see that when i move them it shows up in my software (Virtual DJ) but still nothing happens. i have two floor speakers hooked up to my computer and each deck seems to play out of the corresponding speaker no matter where the crossfader is positioned. also, the LEDs that show the volume levels on the vms2 work when i turn it on but then when i play music they dont work. PLEASE HELP!!!