0.393 Hz? Is that a misprint? That's one cycle every 2.54 seconds. I breathe at a higher pitch than that.

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I breathe at a higher pitch than that.

How is this sung? Is he actually producing this sound with his vocal cords?

As a practical matter, how would you know you are making the sound?, you couldn't hear it.

How would you record it?

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How would you record it?

With 100x video, the sort they use to make short films of a flower growing?