>>Even with a rare well maintained Dampp-Chaser, I've nearly never (if EVER) seen a piano stay within 4c throughout, with the shift from winter/summer/winter. A mere 4c correction is a real luxury for me. Ron N<< Interesting. We have pretty radical humidity swings here in Indiana, but I am finding lots of pianos with a DC system and cover on a regular schedule to be +/- 1 cent. In fact, just last Friday I tuned a G5 with full system that was -4 cent and I was surprised it was out that much. I have found, generally, that adding the cover will keep it more stable than that. Dean
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