Kontrol S2 w/ 4 decks?
Is there a way to do this or do I need to use an external soundcard.
Internally: Yes
Externally: Yes in mono but you need another soundcard to get 4 stereo pairs.
When I change the sample decks to tracks the have no output. Do I need to use a non s2 version of traktor?
The version of Traktor that the S2 comes with is the full Traktor Pro 2. There are some four-deck mappings for the S2 up on the Traktor Bible site, so you can just use them with the current version of Traktor that you’ve been using.