i have a SB x-fi xrtreme audio card, I have never used the mic but recently got some software to learn spanish and tried to use the mic/headphone that came with the software. The mic works fine in other computers, I have tried multiple configurations and have set the "flexiport" to microphone and could not get the thing to work.
I did find that if i spoke into the headphone earpiece it would register on the soudbar for the microphone "Peter dictates...". Why that is I have no idea but it would explain GuyWithCoupleOfProblems post about hearing the TV and dog, but not his voice.