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<DIV><FONT face=Arial size=2>Fred, et all,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>This was what I was getting at in a =
previous
response to the "jumpiness..." thread which this evolved from. -- see =
snip below
-- I must admit though, that I don't recall Virgil's assertion, or =
Jim C's
experimentation. Since I'm constantly checking over the S&S =
D's (used
for everything, since we have no dedicated hall or instruments), I have =
their
tunings stored in Tunelab (formerly SAT & then RCT). Running =
through
the pianos checking open unisons against the stored tuning I often found =
the
unison clean, but drifting slightly, so would check individual strings, =
only to
find them individually "in tune". Aural checks confirmed the =
solidity of
the tuning, but the EDT still saw the un-muted unison as drifting
slightly. Always wondered about that, so this thread has been
interesting.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Otto</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2><><></FONT></DIV>
<DIV><FONT face=Arial size=2>What I find interesting with any ETD =
that I've
tried, is that checking individual strings of a clean, =
at-pitch unison with
the ETD will give a clean reading at the proper
pitch. However, checking the open unison, the ETD will =
sometimes
indicate that it is slightly sharp or flat. Has anyone else =
observed
this? This again points out the need for good aural skills --- but =
I sure
like the TLPocket!</FONT></DIV></DIV>
<DIV><FONT face=Arial size=2><><></FONT></DIV>
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style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>
<A title=fssturm@unm.edu href="mailto:fssturm@unm.edu">Fred =
Sturm</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=caut@ptg.org
href="mailto:caut@ptg.org">College and University Technicians</A> =
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, March 03, 2005 =
5:24
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [CAUT] Sacrifice =
(was
tuners- technology)</DIV>
<DIV><FONT face=Arial =
size=2><><><></FONT><BR></DIV>
<DIV><FONT face=Verdana>yes, I was able to do this, and proceeded to =
read the
unison, with the same care and the same number of samples. And then I =
went
back and repeated every step (re-measuring each string individually, =
etc). My
results: I did not confirm Jim’s data. I found what I consider to be =
completely random results. Sometimes the three strings played together =
would
be flat, sometimes sharp, sometimes the same. </FONT></DIV>
<DIV><FONT face=Verdana><><></FONT></DIV>
<DIV><FONT face=Verdana> First, it is next to impossible to =
tune a unison
within a tolerance of 0.1 cents, and I would say that it is utterly =
impossible
without the use of a machine. It’s a problem of resolution – 0.1 =
cents is at
the threshold of where a pitch produced by a piano string can be =
measured.
They just don’t produce pitch that clearly defined. Variance in =
volume, and
not that large a variance, will change pitch more than
that.<BR><><></FONT></DIV>
<DIV><FONT face=Verdana>the aural resolution of the pitch of three =
strings of
slightly different pitches will be affected by the factor of phasing
(phenomenon where strings will tend to phase with one another, locking =
their
pitches to one another just like PitchLock does), so that it is quite =
possible
that the perceived (and measured) pitch of the entire unison would be =
lower
than the original string, because of one string having a lower pitch. =
And the
unison might sound very clean. A unison within a tolerance of 0.5 =
cents
generally sounds “perfect” to most everybody. But I know most if =
not all of us
can hear a difference of 0.5 cents in context of octaves, M3s and many =
other
intervals.<BR></FONT></DIV>
<DIV><FONT face=Verdana>Regards,<BR>Fred Sturm<BR>University of New =
Mexico
<BR>PS I would be interested in hearing the results of anyone else who =
replicates the described experiment. </FONT>
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