Lermanet_com
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The "Tone Scale" came from "The Tone Arm Scale" of Volney Mathison, the inventor of the E-meter. HOWEVER Hubbard made TWO explosive alterations:
1) Volney determined that 2.0 was not a good place for your tone arm to be, he said it indicated suppression of the person. It was HUBBARD who said Males read at 3.0 and FEMALES read at 2.0 - WHY? Because he wanted women to "grovel at his feet" Volney made NO SUCH DISTINCTION! and in his admissions Hubbard SAID about women:
"You are master of their bodies, master of their souls as you may consciously wish. You have no karma to pay for these acts. You cannot now accumulate karma for you are a master adept. Your voice is low and compelling to them. Singing to them, for you sing like a master, destroys their will to resist."
from The admissions http://www.lermanet.com/scientology-and-occult/psychiatrist-evaluates-hubbard-admissions.htm
and
2) Volney made NO REFERENCES to 1.1, this "tone level" is actually the characteristic of a sociopath, a computing psychotic. Hubbard INSERTED that into the middle of the scale of normal human emotion, to DEMONIZE HUMAN EMOTIONS so that the only relief you might get was by being audited at your expense and Hubbard's gain.