Good Questions, I find some of my pianos change also. I have about 600 readings logged, I'll try to get one of my guys to input this study when i get back home for you all to see. I'm interesed to see the results myself....but I did't take humidity for this study... Next one will have that too. I'm using the SAT to check my tuning "stabilty"..really does a nice job of lookng over my should...when I'm out pounding sand alone. Gregory
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