If you are using Traktor software i would personally recommend the S4. from what i heard it has the best response from hardware to software. probably not a mistake on Native Instruments' side
i think the easiest way would be to just map the mixer to Traktor? using the 'Fader, EQ, Mixer' on this page as a guide http://traktorbible.com/articles/mappin ... inder.aspx ?