I updated to iOS 7 GM yesterday and now my iPod's microphone is totally dead. I first found this out when I went to use Siri and it sat there with an extremely active "sound wave" and wouldn't even acknowledge that I spoke by saying "I didn't understand" or something, so I investigated. I opened voice memos and pressed record. Even while in a silent room it acted like there was a loud noise and when I listened to the recording all I heard was white noise. Video recordings have the same static. My final test was to FaceTime my sister and guess what? THE SAME STATIC! Is this a known bug or hardware issue or what? It would be nice to get help before the 18th when I can bring my iPod into the apple store and have it tested.