I just got my GH4 back from the Panasonic repair facility and the audio buzz has been repaired. I've done a quick test in all modes Creative Movie, M, S, A, and P modes using the Audio-Technica AT875R (only shotgun mic I have) and it's not there anymore when you adjust your shutter speed. Panasonic even updated my firmware to 1.1. Great job Panasonic
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