[Al Skierkiewicz]

Joey,
I was not able to find the pinout for this device but what you describe sounds like the interface is using some of the other +5 volt pins in addition to just pin 1. The OI only feeds +5 on pin 1. I would suspect from your description that there is a second pot for right hand turns and that the pedals are also not getting +5 volts. You will need to check all pins with a multimeter. There are a number of places on the web to obtain gameport pinouts. Use one of those as a starting point. There is also the possibility that this is a MIDI device and as such is incompatible with the OI. Many modern audio cards have MIDI enabled game ports.