Reply to Configuration Setup Help! 2 DJ's + 2 Kontrol S2's + 1 Mac Laptop

My friend and I are trying to connect 2 Kontrol S2's to my mac laptop. We import a .tsi that has 4 deck control for the s2 and turn on one of the S2's and then turn on the next and you completely lose control over the first S2. Not sure why that is happening. Also only one S2 shows up in the drop down list for ins and outs. Is there away to make Traktor see the second S2 under a different name or something? Not sure what to do! Or is there a computer sync solution that wouldn't require any external sound cards?
THANKS FOR THE HELP!