It may be that inharmonicity does change with a variety of factors, such as humidity and voicing. But until we have experimental verification of the degree of measurement error, we don't really know how to interpret those results. Here is my suggestion. In the next month a great many of you may be attending local PTG chapter meetings, perhaps at music stores or other sites that have at least one piano. This would be a great opportunity to try out the "five techs" test. Have someone bring along their SAT and measure the FAC numbers for one piano. Each tech should make the FAC measurements without the others knowing the results until all measurements are made. Then collect the measurements and report the distribution back here on pianotech. I think many of us would be interested in these results. I have no particular hypothesis as to what the five techs test will show, but I anxiously await the results. If any of you share my scientific curiosity, please give it a try. -Robert Scott Detroit-Windsor Chapter
This PTG archive page provided courtesy of Moy Piano Service, LLC