I recently started to play a game on my xbox. It requires me to pull the left trigger very very fast. The trigger is ran off a potentiometer. The controller "fires" at a certain point. I need to make a circuit that can do a pretend pull repeadatly. So it has to be an ajustable voltage that can repeadtly go when I press a button for a couple seconds. So it can be sometime of resonator or something. I am not sure how I could make something that fire the potentiometer to fake a couple "fires". I will get more information later when i open up the controller.