Guess I found it, LTP fade time

Pearl 2000 V1.1 Hi I like to know if its possible to have an acc/deceleration within a movement of a movinghead. For instance if you, in a chase, go from PAN 0 to 255 then in 0 - 126 there is an acceleration and from 127 - 255 there is a decelartion "effect". Your help is much appreciated, Mark