I don't understand the obsession with her singing live. I'd actually rather she didn't. She doesn't sound good when she sings live, at least imo. She should put more effort into improving her dancing.
Not sure if you all remember, but I remember watching a video of her sound engineers from the Circus tour. He mentioned that Brit always likes to be able to hear herself while she is performing.
So her mentioning today that it "doesn't always sound good" is her probably saying "I'm always singing, it just doesn't always sound that great so we have other tracks playing."
She probably has an idea of herself being turned up a little louder than she actually is (but there's no way in hell she thinks she always sings live, lol).
Not the Queen having you all in a 15 page frenzy over her admitting to providing her own angelic vocals on tour that sound exactly like the studio version.