POTs are just the servo potentiometer. If you've ever taken an Xmods Evo's servo apart, it's the little black square. I don't remember what the Gen 1's servo potentiometer looks like since it's been a while since I've taken the servo apart. It's job is to basically make sure the servo is centered after you turn left or right. Here's a picture of the potentiometer in the Evo.
