Help with Controller Mod. Help with circuit

Hmm. Maybe you want to look at a digital potentiometer, like the AD5220. It acts just like a regular potentiometer, except you can "dial it up" or "dial it down" by setting I/O lines high or low. One line tells it whether to go up or down -- high means increment, low means decrement -- and another line acts like a trigger -- for every pulse it sees on that line, it increments (or decrements) one step (out of 127, I think). So to go from zero resistance to full resistance, assuming you had the up/down line wired to I/O pin 1 and the clock (trigger) line wired to I/O pin 2, you'd do something like:

#set up/down line high

HIGH 1

#send 127 pulses on clock line

for i = 1 to 127

   HIGH 2

   LOW 2

next

Just an idea.

Dan