The flattened tops and bottoms indicate the sound is clipped. As a result, it will sound distorted. This happened at one of two times, either during your original shoot as the audio was recorded to your camcorder or when you transferred the sound from the camcorder to your edit app. Hopefully, it was the latter as that can be corrected. However, if the original sound you hear out of the camcorder is hot/distorted, then you’re stuck.
It wasn’t clear from your description if you tried to recapture the audio or just lowered the clip level. Lowering the clip level in the edit app won’t do anything if the audio is already clipped. Try capturing again and set the audio to a lower level than before, and see if this helps. Also, how are you capturing the audio? Are you using a mixer? If so, make sure the mixer’s input is set properly so it’s not overloaded.
Your meters or level indicators don’t always tell you if everything is allright. Any recording device has a series of amplifiers that handle the sound. The gain control usually affects one of the last stages of amplification. So, if the sound being fed to your recorder is too hot (loud) it may overload (clip) the first amplifier (preamp) in the series. Even turning down the gain in a later amplification stage won’t change the fact the intial audio amp is overloaded and distorted. The old Sony BVW-35 field Betacam recorder was famous for its audio being easily overloaded by feeding it too loud a signal. Any time I saw the audio gain controls set below 5, I questioned the sound person to make sure the input level wasn’t too hot.
Bottom line: Always listen to a playback of your audio after the first take (or do tests before the first take) to make sure it’s okay. (It’s not a bad idea for video confirmation, too.)
John
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