Ive used Virtual Dj With the Numark NS7FX for two years... Im a master at it.
I have aupgraded to NS7II and Virtual Dj Wont work with it... therefore a very expensive...
It's too new to be natively supported by VDJ yet. So it's not on the controller list: http://www.virtualdj.com/wiki/VirtualDJ%20Controllers.html But you can download support for it. This was released a couple of weeks ago. Just follow the link above for mapper and instructions