<blockquote style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;" class="gmail_quote">Experience leads me to think the answer is yes, but without an experiment that completely eliminates all the other causes for pitch drop in a piano, which have been mentioned in this thread, it is impossible to say it is so.  I have now devised an apparatus that will enable me to carry out tests and hope in the next few days to get the thing set up.</blockquote> <div> I am VERY eager to hear your findings. Thank you in advance for your work.  To science for it's own sake! Kurt </div>