Bcd3000 super fader Traktor
This fader has different mappings for each side from middle position. When fader is in middle nothing pretty much happens, by moving it up it loads and switch on F92 and a little of Reverb and further is moved it modulate those effects. While sliding it down, it loads Masher and Transpose and modulate those effects in to sweap. I also mapped Masher rate to jogwheel and echo freeze when fader to max up or down position.
http://www.youtube.com/watch?v=zwRTgUzmoRE
I gave example with this effects but it can be mapped for any command in Traktor.
Cheers!