You can assign a sound to one of the sliders, and as you move the slider, it can alter the sound you chose while you play... if you assign it to control the tuning of a sample on a pad, and press the pad and slide the slider it will adjust the tuning of that sample, or do the same for filter, velocity, etc.
and you can record these changes while you sequence... kinda cool to use.
Street tested, Thug approved!