i'm having an unexpected error with my microphone...

Slot 2: NONE
Failed to set format: Invalid argument
Microphone init failed.
DeSmuME 0.9.8 svnr0 NOSSE
SoftRast Initialized with cores=1
i can hear myself through the headset, but none of my programs can "hear" anything...

i should add that i'm using 10.04 LTS