<html> <body> Thanks, Sarah. I'm very mathematically challenged but as long as the 101.3 cents is correct, I'm OK! :-) At 01:53 PM 3/16/04, you wrote: <blockquote type=cite class=cite cite>Hi Avery,   Here's a simple formula for you to calculate how many cents, c, to offset your tuning for any given frequency of "A"...   let c = number of cents offset let F = frequency reference (in your case, 415 Hz)   Note: There are 1200 cents per octave (per doubling of frequency).     F/440 = 2^(c/1200)  (Note: c=0 when F=440.) log(F) - log(440) = (c/1200) log(2) c = 1200 (log(F)-log(440)) / log(2)   c = 3986.3 log(F) - 10536.6   Plugging in 415 Hz for F, c = -101.3 cents offset   Hope that helps.  :-)   Peace, Sarah     <dl> <dd>----- Original Message ----- <dd>From: <a href="mailto:avery@ev1.net">Avery Todd</a> <dd>To: <a href="mailto:pianotech@ptg.org">Pianotech</a> <dd>Sent: Monday, March 15, 2004 11:39 PM <dd>Subject: Re: Beats vs cycles vs cents <dd>Sarah, <dd>Just wondering, but why then do "they" say that to tune to A-415, <dd>one's ETD should be set to 101.3 cents offset? Have I understood <dd>wrong? <dd>Avery <dd>  <blockquote type=cite class=cite cite> <dd>And yes, there are 100 cents between one half step and the next, <dd>  <dd>Peace, <dd>Sarah <dd>  <dd>  <dd>  <dd>----- Original Message ----- <dd>From: <a href="mailto:jjgranas@zigzag.pl">Jean-Jacques Granas</a> <dd>To: <a href="mailto:pianotech@ptg.org">pianotech@ptg.org</a> <dd>Sent: Monday, March 15, 2004 5:44 PM <dd>Subject: Beats vs cycles vs cents <dd>Hi Joseph, <dd>  <dd>So if I understand this right, cents are units along a scale leading from one half tone to the next, while beats are pegged to the specific unison's frquency. Did I understand this right? <dd>  <dd>Peace <dd>jj</blockquote> </dl></blockquote></body> </html>