I bought PT200DX a few months back. New to TIG welding, also taking a TIG class at local community college. My pulse function doesn't seem to be working. I weld a few welds and no pulse. Then it starts working. Where should all my switch be set to. I'm using the foot control. Also when using the foot control I don't seem to have control. It starts the arc but there is no change when I push all the way down or at any point of the travel. Just wondering if I"m doing something wrong. Otherwise I've been happy with the machine.