OK, a little play in words....... In so many sentences you and others are indeed saying that it is not the main reason. I am saying that I think it is. Has the rise and fall ever been measured? Doors and door jams expand and contract as much as 1/4" during each seasonal change. Sound boards do expand and contract a lot. If it is not the expansion and contraction of the sounding board causing it, then, what is? It changes the most in the center of the piano. Strings go sharp from being pushed sharp. What I said, seems to be the most logical explanation. I have a meeting with Yat Lam Hong at 1 PM today. I will ask his opinion on the matter and get back to you with it later on. Jer -----Original Message----- From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Ron Nossaman Sent: Saturday, April 03, 2010 9:55 AM To: pianotech at ptg.org Subject: Re: [pianotech] Pitch Change (was: Grey market pianos, seasoned pianos, etc.) > What are your thoughts on this? No one has said the soundboard isn't involved. What was said is that soundboard rise/fall doesn't change string lengths nearly enough to change tensions enough to produce the tuning changes we hear. So soundboard rise/fall isn't the primary mechanism. That's been established beyond a reasonable doubt. There is lots and lots of discussion on this in the archives. Ron N
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