John Gordon, thanks for your take on it all. Perhaps Vacuum State's unfortunate title for their protractor is a result of "English as a second language." They aren't selling anything, it's a free download they offer on their website. Goatwuss' point regarding "simple geometry" is of course true. Perhaps what is really meant by "ear tuning" is that one finds through fiddling around with their alignment that they prefer the distortion distribution of Lofrgren B points vs. A, as John said.