MOTM

Woops!!  I meant to write that the the wiper of the pot is connected 
to the tip of the plug, not the ring.

>A pedal is a pot wired as a voltage divider.  Typically, the wiper of
>the pot is connected to the ring of the plug, and the jack is wired
>like this:
>
>tip -- voltage in
>ring -- constant voltage out
>sleeve -- ground