lewm,
You remind me of a lot of us when we were young engineers, all striving for exactness in our solutions for every problem. As you know, with experience we learn that often the solution involves approaching the final point without ever reaching it. Why calculus was invented. I used to preach to my wards the need for practicality and to learn the fine art of satisficing. When it comes to things vinyl, exactness is particularly elusive. The subject of the "correct setting" for Anitskate is perhaps Exhibit #1. One of the things that I have observed using AnalogMagik is that the distortion changes for a given AS setting from the beginning of the band on the test record to the end of that band. The band is perhaps 1/2" wide and is the innermost band on the side. So do I set AS for the beginning, the middle, or the end of the test band? What is the "correct setting" for AS. I do not know for sure. What I do, arbitrarily, is pick the setting that yields the lowest overall value for distortion that is repeatable.


