Reply to Scratching Mapping

Can anyone give a clue on how to map the scratching. I have my wheels (Numark stealth) on jog/tempo. I want my alternative controls (when i press shift) to be scratch mode. There are different options such as scratch on, scratch on direct, scratch, and seek mode. I'm not sure which ones I'm supposed to actually map to the jog wheel. None of the combos i've triedsound that great.