Fred, You make some interesting observations... I wonder if the temperature variations that brought about the humidity change may have something to do with it? If the pianos that do this are the same ones and other don't, then monitoring of temperature as wel as humidity would be necessary, but possibly the environments with these "troublesome" pianos may have some thermal anomaly happening in them. Remember that temperature change also causes humidity to change... Just a thought Cheers Mark Bolsius Bolsius Piano Services Canberra Australia ----------
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