Comment: Well I am open to all ideas

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Well I am open to all ideas

and have to agree I wondered in some of the clips about those sounds, BUT listen again to most of the sounds in this video and you not hear them in the majority of recordings.

This guy has an opinion and he is really pushing the limit to make his case. He does not have e good enough case to discount this phenomenon. I am still open to explanations and will keep his in mind.