I pretty much followed this guide (using common sense, ie. I didnt route any audio), but rather than using 2 S4's, I used a MAC running Traktor and a S4 running Traktor on a PC.

On the MAC I used a USB to midi connection (YOU ONLY NEED ONE CABLE). I made the MAC the master and the S4 slave. MIDI OUT (MAC) > MIDI IN (S4).

It doesnt have to be a S4, it can be 2x native instruments sound cards, or anything really. Once you get your head round this guide as a base, I think it'll be pretty easy to sync anything with Traktor.

Its (pretty) dead simple.

Cant wait for my Roland TR-8 now!

http://www.traktorbible.com/en/kontr...ng_two_s4.aspx