I am currently using FMS and would like to make my own interface to link my JR transmitter to it. Does anyone have instructions on how do make your own?

I am running Win XP, which would be the best connection type (serial, usb, gameport)??? Has anyone heard anything about this new interface that lets you connect using the audio input of your sound card???

I suppose I could brake down and buy one, but what would be the fun in that???