Since upgrading to ios 6, if I'm in a FaceTime call, and I go to multitask with something that uses sound, say Netflix, the sound only goes to about half volume in Netflix. After hanging up in FT, it returns to normal. Very annoying.
Also, the noise reduction feature makes the incoming sound quality in FaceTime very choppy.
Also, if I'm in FT and I lock the screen, I have to push the on button and swipe twice to unlock the device.