>I have always considered sound board rise (or fall) to be the biggest >factor in seasonal pitch changes Everyone always has, as far as I know. But then we've thought the pitch drop during a pitch raise was from soundboard deflection too until fairly recently. >, and bridge rise relative to the >sound board must surely compound the effect. Which is one of the factors that hasn't usually been considered. I think the increase in string path length across the bridge is more a factor than has been considered too. I'll have to try to work out how to calculate the change. Ron N
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