The Dillman Seminar

IMHO the people who do and teach Kyusho style material have forgotten, or enver knew, that the "lessons" tehy are teaching are metaphors for the real knowledge; things that at the time couldn;t be explained by their limited understanding of biology, anatomy etc. Nowadays we know so much more about how the body works, nerves, muscles, psychology etc etc. yet even when presented with concrete physical explanations ("when the body detects a shearing force in the C1 ro C2 vertebrae it will immediately go limp in order to protect the brain stem" for example) tehy insist that there is some other more mystical or esoteric thing at work ("yes but a kyusho KO uses energy transfer").
I think the use of sound is even more suscpetible to this. I think there are two mechaisms at qwork when sound is used properly: one in the defender and one in the attacker.
When you, as the defender, make one sound as opposed to some other sound or no sound - your internal musculature is different. The muscles in your abdomen, chest, neck and head are used differnetly and this will change how the rest of your body moves in subtle ways. Say "Saaaa" and "oooo" and you can feel the difference.
Second, different sounds can sometimes have an effect on the thought process of the attacker. This effect is even more subtle and on its own probalby not effecgtive but combined with multipe other pieces... it all adds up.
However I've seen that the Kyusho teachers almost universally want to beleive that the "energy" of the sound is doing something magical, or something that "sciecne cannot yet explain".
So when I get together with Kyusho people (quite often really) I try to analyze what they are teaching me through that lens: what is this a metaphor for, and how is this physically making my movements or the attacker's movements or postures different than if I was doing it some other way.