Reply to S4 crossfader mapping

HI gUYS ,

I DONT USE MY CROSSFADER AND WAS THINKING OF MAPPING IT TO PERHAPS THE FX OR HAS ANYONE TRIED TO USE THE CROSSFADER SOMEHOW LIKE IT IS USED IN TORQ2 WHEREBY THE CROSSFADER IS LINKED TO EFFECTS AND AS YOU GO FROM DECK A TO B THE EFFECT MORPHS THE 2 TRACKS TOGETHER.
I HAVNT GOT A CLUE HOW TO MAP STUFF AS LAST TIME I TRIED IT ALL WENT A BIT PETE WHATCHA CALLHIM.

THANKS IN ADVANCE