I serviced a 1940 Chickering Studio today. Hadn't been tuned in decades - very good condition. It was 140 cents flat. I did an FAC calculation with the strings 140 cents flat. FAC values were 10.5, 11.2, and 8.5. Raised the pitch up to A440. Figured maybe I should double check - maybe inharmonicity would change. FAC values @ A440 were 8.7, 9.7, and 7.0. All decreased by about 1.5. I would imagine this simply follows some sort of theory, which obviously I have no knowledge of. Just thought some might be interested. :-) Terry Farrell
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