Nice paper, John. Precise, effective, informative, discerning, useful, as always. Thanks. Stéphane Collin. P.s. : John, I remember having seen a description by you for making old style dampers. I'm facing the situation, but can't find the link to it. Could you post it again ? Thanks again. You'll find more usable practical formulae derived from the basic Mersenne formula here, with explanations: <http://pianomaker.co.uk/technical/string_formulae/> JD
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