Why do Pianos go “out of tune”?…

Changes in humidity and temperature, cause the soundboard and wooden frame parts, to expand and contract. During winter heating months, the soundboard shrinks and the pitch goes down. In the summer, the opposite occurs – humidity causes expansion and the pitch rises. Dampp-Chaser Systems greatly reduce these effects and also prevent corrosion and other problems.

http://www.pianolifesaver.com/english/products/grandsystem

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