Reply to Need Help Mapping my Axiom 25

I have Traktor Scratch Pro and an M-Audio Axiom 25 MIDI controller. I would like to use it as a controller for Traktor. But when I plug it in an try to use the learn button to recognize keys nothing happens. Also of note is I got the controller second hand and do not have the 12v power supplier. The only thing powering the controller is the usb cable. Do I need to download any drivers? I'm stumped right now so any instructions you could provide me with would be extremely helpful!

Thanks Neil