Reply to Using 2 of the same midi controllers for Traktor?

Hi, I'm trying to use two Numark Mixtrack Pros with Traktor so that I can control 4 decks at once. The problem is that Traktor recognizes the two mixtracks as only one unit so any midi mapping gets applied to both.

How can i get Traktor to recognize the two controllers separately (say Mixtrack Pro 1 and Mixtrack Pro 2) so that I can map 2 decks to one controller and the other 2 decks to the other controller?

Thank you all for your help!