I took an old cstick from a gc controller, and I wired one of the pots to c-up and c-down. It worked.
I wired ground to the middle contact, and c-up to the up on the joystick and c-down to the opposite.
However, testing quick relay like some games need, I don't know if this is a good thing. I may isolate the grounds from the c-pad from everything else. How many ground pins are there that go directly to the chip?
I'm still playing around with it. Here's a pic

SS
