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I've also experienced the microphone not behaving properly. Had a done a little more investigation I'd have noticed what has been pointed out in the comments: that the VRef for the mic isn't 5V, but 2.5V. This isn't enough to properly power the mic and you will get muted or garbled sound when you speak.
So what to do? Well more investigation. (I'm also open to more suggestions from readers/users of this blog.) Eventually, if I get it figured out I'll update the blog with new diagrams and pictures. Until then stay tuned and keep the comments coming.


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