Nice audio. I was concerned that an open intake would have too much turbo in the audio but that wasn't the case with your video. As soon as I get my 12' extension cable I'll give that a try. Do you have a pic of where you mounted your mic?
I did another test today using just the microphone, USB adapter and the Hero3 without the case. I only get audio out of the left channel only with the ME52W. I tried again with the mic from my gaming headset and was able to get 2 channel audio. I thought the ME52W was a stereo mic but apparently not.
