One of the most popular mappings from Native-Instruments official mapping directory, my mapping has been reworked for the newer versions of Traktor.  This mapping remaps the Shift+Effects buttons and the shift+browse wheel to browse effects quickly:

Shift+On: Switch between advanced and chain modes
Shift+FX1/2/3: Select which FX bank to browse
Shift + Browse: Browse effects.

Example:  Press Shift+On to switch the bank to chain mode.  Press Shift+FX1 to select that slot for browsing.  Turn the Shift+Browse rotary to change the effect for that slot.