[dmitch]

That does help quite a bit. So do I need to open and define in begin.vi? If so, how do I say "motor 1 is actually referenced as 'window 1'"?

Sorry, I know the PWMs are supposed to be different numbers for the motors, I justy have not yet done that. Thanks, though.

We are taking voltage readings from a pot to position the arm.

So the basic syntax will be right if i move the refnum, is the PID correct? As in, will it move window 1 and window 2 to position x when button y is pressed?