Marc Damashek writes: > If the frequencies implausibly change by different (relative, > fractional, percentage, NOT absolute) amounts when the piano structure > swells and raises the tension, then all bets are off. What some people are saying is that the relative frequencies DO change. If they are right, (and my casual observations support this; I haven't had time for a controlled experiment), here's how it would be possible: 1. Inharmonicity is dependent upon, among other things, the length of the string for a particular pitch. 2. As the moisture level of the soundboard changes, its stiffness changes. 3. Because of a stiffer termination, the string "acts" shorter, even when returned to the original pitch, changing its inharmonicity. Also: If the soundboard swells, what makes the pitch go up? Doesn't the deflection from horizontal increase, and doesn't the string get longer? If the tension is then lowered on that string, doesn't the string remain longer because the sbd is in a different position? Bob D
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