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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Sorry to post again, but the first paragraph
in my first post wasn’t as clear as it should have been. It should read
as follows:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Sounds to me like you’re pitch
raising aurally, which is what I’m doing. From what you’re describing,
I’d say that you are setting the wrong goal of getting A4 to be exactly
at A440 after a pitch raise. </span></font><font size=2 color=red face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:red'>It sounds like you’re
setting A4 too high, which makes the middle section sharp.</span></font><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'> My goal is for most of the piano to be reasonably close to pitch
rather than A4 be exactly at A440.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><snip><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>John Formsma<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] <b><span
style='font-weight:bold'>On Behalf Of </span></b>David Nereson<br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, July 07, 2006 2:24
AM<br>
<b><span style='font-weight:bold'>To:</span></b> List Pianotech<br>
<b><span style='font-weight:bold'>Subject:</span></b> post pitch-raise creep?</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=4 face=Arial><span style='font-size:13.5pt;
font-family:Arial'> I do many many many pitch raises --
almost every piano I tune, for the last 27 years. (Almost everybody lets
them go too long.)</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=4 face=Arial><span style='font-size:13.5pt;
font-family:Arial'> I've found that the ideal average
overpull is halfway between 1/3 to 1/2 the amount sharp as it was flat.
In other words, a 41% overpull of the amount it was flat. For an
easy-figuring example, say the piano is 18 cents flat. Half of that is 9
cents and a third of that is 6 cents. Half-way between 6 and 9 is 7.5, so
I pull it 7.5 cents sharp, and almost invariably A4 ends up right on 440 Hz, or
very close. </span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font><font size=4 face=Arial><span
style='font-size:13.5pt;font-family:Arial'>However, if the piano is a
half-step flat, I don't pull it 41 cents sharp. That would be too
much. There's some degree of flatness where the usually-ideal 41%
overpull has to taper off. For a half-step pitch raise, I usually
overpull so that A4 is beating about 5 beats sharp. That's approximately
20 cents, I believe. Sometimes more is required, sometimes less. It
varies. That's here in <st1:City w:st="on"><st1:place w:st="on">Denver</st1:place></st1:City>
-- probably different elsewhere. </span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=4 face=Arial><span style='font-size:13.5pt;
font-family:Arial'> But what I often experience
is: even though after the pitch raise, A4 is at 440; after I've gone
through the fine tuning and pulled in
unisons, when I go back to do the final check and touch up anything that has
slipped, I find that the whole middle section is sharp! Why?</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=4 face=Arial><span style='font-size:13.5pt;
font-family:Arial'> --David Nereson, RPT</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=4 face=Arial><span style='font-size:13.5pt;
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