<HTML> <HEAD> <TITLE>[CAUT] Re. Link to Young Paper</TITLE> </HEAD> <BODY> Dear Fred- I wonder if you could expand on this a bit more. I attempted to calculate FAC this way after reading your post but I must have done something wrong. The difference between the first and fourth partial of A4 seemed to yield a wider octave ( larger A number, to be expected I suppose) than the normal reading,  but the difference between the first and fourth partial of C 6 yielded numbers well into the 20’s or 30’s! I tried the the difference between the first and second partial of C7 as well and still no real usable numbers for me. There must be a way to enlighten me! Hope all is well in New Mexico. Regards- David > [CAUT] Re. Link to Young Paper > Fred Sturm  fssturm at unm.edu > Thu Jan 18 11:04:02 MST 2007 > >         I don't think they occur only on bass strings. Plain wires can also   > have anomalies, as I discovered when I first started tuning with an   > SAT a little over ten years ago. I found that results were "odd"   > often enough that I looked into it a bit. SAT relies on the   > discrepancy between two partials to predict a virtual partial ladder.   > I found that I could get a better calculated FAC tuning if I measured   > the distance between the A4 and A6 partials of A4, and between C6 and   > C8 partials of C6 (as opposed to A5 and A6 partial of A4, C6 and C7   > partial of C6), and extrapolated a result. The distance between 1st   > and 4th partial seemed to "average out" the anomalies in the   > measurement between 2nd and 4th, 1st and 2nd, and yield a result that   > calculated better tuning spreadsheets. > > > Regards, > Fred Sturm > University of New Mexico > fssturm at unm.edu > > > > David C. Brown                                          Office - 1-480-965-6760 Piano Technician                                        david.c.brown.2@asu.edu School of Music                                           Cell- 1-480-751-7715 Arizona State University </BODY> </HTML>