exponential sorry for the miss spelling but i slow the servo movement for the amount of steering input on some radio's it is listed as arc it removes sensitivety from small steering input faster servo's with make it feel twichy like minor line corrections at speed on my cheapo ace cougar i have to trick the system to reduce the sensitivety around 0 input by turning the endpoints all the way up then dialing back the arc to - 40 and dial back the dual rate until the steering is not bound up a full lock on my JR i set the endpoints as the should be and just back down the exponential until it feels right not to sudden around center one could also do it by using a inner hole on the servo saver