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Maggie, I think that pretty much rules out the strings as the direct cause though they could be driving some other part of the piano in some mysterious way. Longitudinal waves remain constant, being length, ...

Hi Wim, I don't know if Steinway offers a damper class - not the last time I checked, but maybe Daniel D. from Steinway can comment. I've attended (or in some cases taught) at all of those classes ...

"... or a hard surfaced staircase." That's an interesting one I hadn't considered. Btw, an engineer once told me the effect off of ceiling fans is due to the echos bouncing off the moving blades. ------------------------------ ...