My work around is that I bought a "line in" cable and a "two into one headset jack" (you can play two headsets at the same time). I put one end into the microphone and one end into the headset jack. I then plugged a head set into the extra headset jack. This allows me to hear and record via the "microphone line in" option.
At least it is a "work around"
BTW: I did a search using No+Stereo+Mix+Vista and did not see a solution for SigmaTel. If this is already mentioned, I apologize for a double post.
^^Grumpy^^