Yesterday I pitch raised an old upright over 100 cents. The tone of the piano went from slightly bright to very dull. I have seen this happen before on a few unisons or maybe one section but in this case the entire piano is now very dull sounding. What causes this? The hammers are grooved, does the pitch change somehow change the string plane or spacing? chris -- Christopher D. Purdy R.P.T. School of Music, Ohio University Athens, Ohio 45701 (740) 593-1656 fax (740) 593-1429 purdy@ohiou.edu
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