Reply to traktor s2 & x1 trying to use 4 channels

HeY guys just bought the traktor x1(older version) because i was told that I can use it with my s2 for 4 deck control .
When I hook it up to my computer it will only allow me to do 2 decks I have also tried to use some of the midi mappings available and they do not work either.

Can somsone help or post a video tutorial about this