<div> John:<br> <br> <font face="Arial, Helvetica, sans-serif">There's another interesting phenomenon which is quite useful as octave comparisons. If you tune A3-A4 as a 2:1 octave, and F3-F4 as a 4:2 octave, <u>then</u> re-tune F3-F4 as a 6:3 octave and note the differences in the effect on the contiguous M3's, it will tell you a lot about the "stretch" and inharmonic characteristics of the piano and allow you to decide how much to open up or squeeze F3-A3 around its nominal 7 beats/sec. This works even better in the low tenor where one would be tuning 6:3 octaves normally. If you tune an octave, say A2-A3 as 6:3, and conclude that you like it, then use the 4:2 octave test of M3-M10 (F2-A2, F2-A3) and listen for the difference in desired beat rates, it will tell much about the stretch/inharmonic qualities of any given piano. Generally, in a well-scaled piano, the two tests will yield nominal differences; the differences become acute in poorly scaled pianos. <br> <br> Paul<br> </font></div> <div> <br> </div> <div> <br> </div> -----Original Message-----<br> From: John Formsma <formsma@gmail.com><br> To: Pianotech List <pianotech@ptg.org><br> Sent: Mon, 27 Oct 2008 9:31 pm<br> Subject: Re: Contiguous Major Thirds Accuracy?<br> <br> <div id="AOLMsgPart_2_52ed848b-1372-424c-ac1d-5477dbe06353"> <br> <br> <div class="gmail_quote">On Mon, Oct 27, 2008 at 6:34 AM, Jeff Deutschle <span dir="ltr"><<a href="mailto:oaronshoulder@gmail.com">oaronshoulder@gmail.com</a>></span> wrote:<br> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div><br> </div> <div>J.F:</div> <div> </div> <div>You mention the importance of identical octave widths when tuning CM3's. Would this mean that if octave widths are tuned differently to compromise for a challenging break, that CM3's cannot be used?</div> </blockquote> <div><br> </div> <div><br> </div> <div>I was referring to the two primary octaves used in setting an F3-F4 temperament: A3-A4 and F3-F4.  It becomes self-evident ....   Let's say you tune A3-A4 as a 2:1 octave, then tune F3-F4 as a 6:3 octave.  It is then impossible to get contiguous M3s that are in a 4:5 ratio.   <br> </div> </div> <br> -- <br> JF<br> </div>  <div id='MAILCIAMA023-910949068f1b3bb' class='aol_ad_footer'><BR/><FONT style="color: black; font: normal 10pt ARIAL, SAN-SERIF;"><HR style="MARGIN-TOP: 10px"></HR>McCain or Obama? Stay updated on coverage of the Presidential race while you browse - <a href="http://pr.atwola.com/promoclk/100000075x1211139166x1200680084/aol?redir=http://toolbar.aol.com/elections/download.html?ncid=emlweusdown00000002">Download Now!</a></FONT> </div>