Numark Mixtrack Pro Headphone Port Not Working!

I'm using Cross DJ 2.2.0 and I just bought the Numark Mixtrack Pro. I can't hear anything coming from it. I've changed the soundcard option to the Mixtrack Pro but nothing. Help!?
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MusicMeister wrote:Keep in mind, since CrossDJ supports WDM you shouldn't have to install the ASIO drivers or ASIO4All like they suggest you do for Traktor.