> Dear Fred- > > MUCH clearer! Thanks so much. You are the man. > > David > > > >> Hi David, >> The A4/A6 difference needs to be multiplied by 0.8, to factor out the >> difference between 1st and 2nd partial and leave the difference between 2nd >> and 4th partial. The C6/C8 difference needs to be multiplied by 0.2 to >> factor out the difference between 2nd and 4th partial and leave the >> difference between 1st and 2nd partial. The difference between 1st and >> second partial is 1/4 the difference between 2nd and 4th partial (it¹s a >> logarithmic scale, based on a square of the difference between partial >> numbers, kind of). >> So, if you read A4/A6 as 10 (zero A4 and read its 4th partial at A6 as >> plus 10 cents), you enter 8 as the A number. When you have calculated the >> tuning, the number for A4 (the tuning offset, tuning it¹s 4th partial) will >> be 10. For C6/C8, if the number is 35 (C6 zeroed, its 4th partial at C8 read >> as plus 35 cents), you enter 7. (Obviously when you enter the number, you >> have to go to the right note name and octave, and scroll cents up or down). >> Is this clearer? >> (BTW, David is referring, I believe, to some posts I sent to pianotech >> around ten years ago, when I was coming to terms with my SAT). >> >> Regards, >> Fred Sturm >> University of New Mexico >> >> -- David C. Brown Office - 1-480-965-6760 Piano Technician david.c.brown.2 at asu.edu School of Music Cell- 1-480-751-7715 Arizona State University -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/caut.php/attachments/20070119/e79af005/attachment.html
This PTG archive page provided courtesy of Moy Piano Service, LLC