Hi All-- I have a C521 with SigmaTel on-board audio & running XP. Just last evening I noticed that when in Volume Control (Playback), there is no microphone level adjustment. The mic adjustment does appear in Recording. I downloaded the newest drivers, but to no avail. Is there anyway short of hunting for either a low profile PCI sound card or a USB sound card, that I can activate the mic control in Playback?? Thanks so much.