I have a bizarre problem on my 6 and just wondering if the same mic is used to record audio regardless of which camera (front or back) is used to record video. If I record video using the front camera, I get clear audio on the recording. If I record using the primary camera on the back I only get a static sound and the audio is extremely faint, almost imperceptible. As far as I know the phone only has one mic. Therefore it would seem it would have to be a software glitch of some kind. I guess I can try and wipe everything and see if that works but I'd rather not. I have an appt at Apple on Tuesday.