---------------------- multipart/alternative attachment At 03:35 PM 4/10/2004 -0400, you wrote: >In a message dated 4/10/2004 2:00:24 PM Central Standard Time, >pianotuna@accesscomm.ca writes: >Hi Wim, > >Possibly you are pounding too hard. Very small changes in humidity cause >pitch instability in unisons. I've documented that on the ptg list. I wish >I had better tools to analyse what is going on. Temperature (stage lights) >as I'm sure you know can make huge differences very very rapidly. > >I know stage lights can make a difference, but those differences are by >way of the soundboard. Stage lights affect the strings, (and to a lesser degree, the plate), not the soundboard. Humidity affects the soundboard. >If the humidity causes pitch instability, why just one one string? Why not >in all of them? The amount of non-speaking length between tuning pin and nearest pressure point is strongly related to "which" strings are affected. Depending on "what" is doing the affecting, so-to-speak, methinks. >Why do some strings go up, and other go down? Over-pounding will make strings go sharp, later. Sometimes much later, like... after some chords and pedaling have taken place. For performance pianos, I always do a series of four-note chords with both hands and lots of pedal. Brings out the weak pin technique quickly. Check, double check, and then.... check again. It's the only way I can keep from being embarrassed. Even then.... > >Wim Later, Guy ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/caut.php/attachments/8b/80/51/a5/attachment.htm ---------------------- multipart/alternative attachment--
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