don't use the standard/skeleton housing if you're using the audio direct from the gopro/sj4000 cam. use the plastic frame for "better" audio quality
I agree. The sound gets really muffled when using the shock-proof case even with the open-back housing door (for the touch screen).
I shot this video though without a case at all and the camera was just being held by a lazy pod but I still find a lot of top end was lost. I guess I'd have to record the sound separately and just edit it in.
For live use though I find that the audio doesnt clip even with loud stage volumes because of the dampening effect of the shock-proof case. Gosh, you just made me GAS for an open frame bwahaha!