Look on page 5 of the
OI Reference Guide (which Damian previously posted). Pots need to be wired to the +5V pin (which is pin 1) rather than ground. The other end goes to the analog input. It doesn't really matter which way you connect it as long as you have the "wiper" pin (typically the middle) and one of the edge pins. Also, you can use an
ohmmeter to test the pot before you wire it.
Audio pots are generally bad for OI use, because they are made to be used as a volume control and therefore are
not linear. Each degree of rotation of the pot does not result in the same change in resistance.