LOAD BUTTON MUST BE SET TO JOG MODE: FX VIA KONTROL S4 TAB IN PREFS MENU

4 sample play buttons just below loop encoders each bring up a different macro effect which can be manipulated with the jog wheel (with load / fx engaged)

Loop IN & OUT buttons now move beatgrid, with shift engaged they zoom in and out and pressing the left encoder sets a grid marker.... Be sure to have grid marker stored as hot cue in the preferences.

Follow link for detailed guide  and pics 
http://djmatthewstar.blogspot.ca/2012/10/custom-traktor-s4-mapping-for-version-26.html?spref=fb