I am putting all of my usb devices in an external enclosure to simplify my wiring as in my jeep I don't have room to put all my devices in one spot, so I must make it modular so to speak. anyway, I'm trying to hardwire a 4pin audio connector to the pcb of the sound card, however I cant figure out the pin outs for the life of me. the port is off unless something is plugged in which I haven't figured out how to bypass.

has anyone done something like this? i've search google to the end of earth and back and I havent turned up anything relavant... any help would be appreciated!!