Here is the real audio feed from her mic during an old HBO special that she did. She sings along so that the lip synching looks accurate then they turn her mic on in between songs so she can talk to the audience.
She sounds terrible, but damn she looks good in this video.
well crap I can't get the embedding to work.
Here is the link
https://youtube.com/watch?v=3Ak1cpi74RM