Yes it does. Expansion of the wood with higher EMC will increase crown and stiffness through the structure. As you may have experienced, especially with compression type soundboards, the sound of the piano can change quite a bit seasonally. David Love www.davidlovepianos.com -----Original Message----- From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Andrew Anderson Sent: Tuesday, April 06, 2010 6:54 AM To: pianotech at ptg.org Subject: Re: [pianotech] Pitch Change, etc. Does humidity change also change internal tension and impedance within wood? Seems to me, that tone changes a little with humidity too. Perhaps there are a number of complicating factors to consider in concert to reach the effect: pitch change that we are talking about. Andrew Anderson
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