If the harmonics (octave) of the frequency have the same effects. If it's possible to "sing" the frequency?

https://www.youtube.com/watch?v=7zZainT9v6Q&index=6&list=RDqx8hrhBZJ98
He sounds the fundamental frequency, then articulates the harmonics with his throat. Note that a cat's purr is actually self-rifing.

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