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A very brief introduction to how the thickness of the vocal folds affects the volume of the voice!
What I forgot to mention in this video is that some people definitely do have thicker true vocal folds than others - if a person’s voice has gone through a testosterone-induced change, their vocal folds are naturally going to be thicker. This means they can go to much lower pitches than someone who hasn’t gone through this change, and generally they can be louder, too.
There are also other things that effect the volume/strength/projection of the voice, including bringing out different harmonic overtones like we do when adding twang (narrowing the aryepiglottic sphincter).
As with all things in the body, every body is different and the range of variation is wide!
In my demonstration, which isn’t perfect, I’m also tilting my cricoid cartilage when I make the really loud sound which helps the vocal folds become even thicker.
Thanks so much for the question @norfickchick!
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