If iH is greater at lower tension, this should be a reminder to ETD users not to count on measurements made when the piano is significantly below pitch. When I could only tune with an ETD, at first I measured iH on every piano before tuning. I realized later it was better for a piano I'm seeing for the first time to measure existing pitch using a tuning file I already have for a similar piano, then pitch raise, and then measure iH to create a custom file for this piano. Will the iH error be significant for a piano 20 cents flat? --Cy-- Cy Shuster, RPT ABQ, NM www.shusterpiano.com
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