<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML xmlns:o = "urn:schemas-microsoft-com:office:office"><HEAD>
<META content="text/html; charset=UTF-8" http-equiv=Content-Type>
<META name=GENERATOR content="MSHTML 8.00.6001.19019"></HEAD>
<BODY style="FONT-FAMILY: Arial; COLOR: #000000; FONT-SIZE: 10pt" id=role_body
bottomMargin=7 leftMargin=7 rightMargin=7 topMargin=7><FONT id=role_document
color=#000000 size=2 face=Arial>
<DIV>Makes much more sense now and closer to my understanding. Thanks. Large
vente to go. :-)</DIV>
<DIV> </DIV>
<DIV>P</DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 3/16/2011 3:28:12 P.M. Central Daylight Time,
del@fandrichpiano.com writes:</DIV>
<BLOCKQUOTE
style="BORDER-LEFT: blue 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: 5px"><FONT
style="BACKGROUND-COLOR: transparent" color=#000000 size=2 face=Arial>
<DIV class=WordSection1>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Comic Sans MS'; COLOR: navy; FONT-SIZE: 11pt">Actually
“sustain rate” should be “decay rate.” The rate at which the sound energy
dissipates whether into the bridge or elsewhere. In general a note with a high
decay rate will also have a short sustain time but this is not always the
case. Sometimes the energy in certain partials—usually the higher partials—can
decay at a rapid rate while energy in other partials—usually the fundamental
and lower partials—can continue sounding for a reasonable amount of
time.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Comic Sans MS'; COLOR: navy; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Comic Sans MS'; COLOR: navy; FONT-SIZE: 11pt">Not enough
coffee.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Comic Sans MS'; COLOR: navy; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Comic Sans MS'; COLOR: navy; FONT-SIZE: 11pt">ddf<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Comic Sans MS'; COLOR: navy; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Comic Sans MS'; COLOR: #632423; FONT-SIZE: 10pt">Delwin D
Fandrich</SPAN><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #632423; FONT-SIZE: 10pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Comic Sans MS'; COLOR: #632423; FONT-SIZE: 10pt">Piano
Design & Fabrication</SPAN><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #632423; FONT-SIZE: 10pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #632423; FONT-SIZE: 10pt">6939
Foothill Court SW, </SPAN><SPAN
style="FONT-FAMILY: 'Comic Sans MS'; COLOR: #632423; FONT-SIZE: 10pt">Olympia,
Washington 98512 USA<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Comic Sans MS'; COLOR: #632423; FONT-SIZE: 10pt">Phone
360.736.7563 — Cell 360.388.6525</SPAN><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #632423; FONT-SIZE: 10pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Comic Sans MS'; COLOR: #632423; FONT-SIZE: 10pt"><A
title="mailto:del@fandrichpiano.com "
href="mailto:del@fandrichpiano.com%20"><SPAN
style="COLOR: blue">del@fandrichpiano.com </SPAN></A></SPAN><SPAN
style="FONT-FAMILY: 'Comic Sans MS'; COLOR: #632423; FONT-SIZE: 10pt">—
</SPAN><SPAN
style="FONT-FAMILY: 'Comic Sans MS'; COLOR: #632423; FONT-SIZE: 10pt"><A
title=mailto:ddfandrich@gmail.com href="mailto:ddfandrich@gmail.com"><SPAN
style="COLOR: blue">ddfandrich@gmail.com</SPAN></A></SPAN><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: navy; FONT-SIZE: 11pt"><o:p></o:p></SPAN></P></DIV>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Comic Sans MS'; COLOR: navy; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<DIV>
<DIV
style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; PADDING-RIGHT: 0cm; BORDER-TOP: #b5c4df 1pt solid; BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<P style="MARGIN-LEFT: 36pt" class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">From:</SPAN></B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">
pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] <B>On Behalf Of
</B>PAULREVENKOJONES@aol.com<BR><B>Sent:</B> Wednesday, March 16, 2011 12:36
PM<BR><B>To:</B> pianotech@ptg.org<BR><B>Subject:</B> Re: [pianotech] Tuning
the duplex sections<o:p></o:p></SPAN></P></DIV></DIV>
<P style="MARGIN-LEFT: 36pt" class=MsoNormal><o:p> </o:p></P>
<DIV>
<P style="MARGIN-LEFT: 36pt" class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: 10pt">Actually,
I'm unclear on this terminology. Can you distinguish "sustain rate" and
"sustain time"? Thanks.<o:p></o:p></SPAN></P></DIV>
<DIV>
<P style="MARGIN-LEFT: 36pt" class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: 10pt"> <o:p></o:p></SPAN></P></DIV>
<DIV>
<P style="MARGIN-LEFT: 36pt" class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: 10pt">Paul<o:p></o:p></SPAN></P></DIV>
<DIV>
<P style="MARGIN-LEFT: 36pt" class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: 10pt"> <o:p></o:p></SPAN></P></DIV>
<DIV>
<DIV>
<P style="MARGIN-LEFT: 36pt" class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: 10pt">In a
message dated 3/16/2011 1:11:13 A.M. Central Daylight Time, <A
title=mailto:del@fandrichpiano.com
href="mailto:del@fandrichpiano.com">del@fandrichpiano.com</A>
writes:<o:p></o:p></SPAN></P></DIV>
<BLOCKQUOTE
style="BORDER-BOTTOM: medium none; BORDER-LEFT: blue 1.5pt solid; PADDING-BOTTOM: 0cm; MARGIN-TOP: 5pt; PADDING-LEFT: 4pt; PADDING-RIGHT: 0cm; MARGIN-BOTTOM: 5pt; MARGIN-LEFT: 3.75pt; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0cm">
<DIV>
<P
style="MARGIN-LEFT: 36pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><SPAN
style="FONT-FAMILY: 'Comic Sans MS'; COLOR: navy; FONT-SIZE: 11pt">My tests
demonstrated that when the tuned front duplex system is working as
advertised sustain rate increases and sustain time decreases. Think of it in
terms of conservation of energy.<o:p></o:p></SPAN></P>
<P
style="MARGIN-LEFT: 36pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><SPAN
style="FONT-FAMILY: 'Comic Sans MS'; COLOR: navy; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P
style="MARGIN-LEFT: 36pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><SPAN
style="FONT-FAMILY: 'Comic Sans MS'; COLOR: navy; FONT-SIZE: 11pt">ddf<o:p></o:p></SPAN></P>
<P
style="MARGIN-LEFT: 36pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><SPAN
style="FONT-FAMILY: 'Comic Sans MS'; COLOR: navy; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<DIV>
<P
style="MARGIN-LEFT: 36pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><SPAN
style="FONT-FAMILY: 'Comic Sans MS'; COLOR: #632423; FONT-SIZE: 10pt">Delwin
D Fandrich</SPAN><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #632423; FONT-SIZE: 10pt"><o:p></o:p></SPAN></P>
<P
style="MARGIN-LEFT: 36pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><SPAN
style="FONT-FAMILY: 'Comic Sans MS'; COLOR: #632423; FONT-SIZE: 10pt">Piano
Design & Fabrication</SPAN><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #632423; FONT-SIZE: 10pt"><o:p></o:p></SPAN></P>
<P
style="MARGIN-LEFT: 36pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #632423; FONT-SIZE: 10pt">6939
Foothill Court SW, </SPAN><SPAN
style="FONT-FAMILY: 'Comic Sans MS'; COLOR: #632423; FONT-SIZE: 10pt">Olympia,
Washington 98512 USA<o:p></o:p></SPAN></P>
<P
style="MARGIN-LEFT: 36pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><SPAN
style="FONT-FAMILY: 'Comic Sans MS'; COLOR: #632423; FONT-SIZE: 10pt">Phone
360.736.7563 — Cell 360.388.6525</SPAN><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #632423; FONT-SIZE: 10pt"><o:p></o:p></SPAN></P>
<P
style="MARGIN-LEFT: 36pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><SPAN
style="FONT-FAMILY: 'Comic Sans MS'; COLOR: #632423; FONT-SIZE: 10pt"><A
title="mailto:del@fandrichpiano.com "
href="mailto:del@fandrichpiano.com%20">del@fandrichpiano.com </A>— <A
title=mailto:ddfandrich@gmail.com
href="mailto:ddfandrich@gmail.com">ddfandrich@gmail.com</A></SPAN><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: navy; FONT-SIZE: 11pt"><o:p></o:p></SPAN></P></DIV>
<P
style="MARGIN-LEFT: 36pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><SPAN
style="FONT-FAMILY: 'Comic Sans MS'; COLOR: navy; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<DIV>
<DIV
style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 0cm; PADDING-RIGHT: 0cm; BORDER-TOP: #b5c4df 1pt solid; BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<P
style="MARGIN-LEFT: 72pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: black; FONT-SIZE: 10pt">From:</SPAN></B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: black; FONT-SIZE: 10pt">
pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] <B>On Behalf Of
</B>PAULREVENKOJONES@aol.com<BR><B>Sent:</B> Tuesday, March 15, 2011 10:46
PM<BR><B>To:</B> pianotech@ptg.org<BR><B>Subject:</B> Re: [pianotech] Tuning
the duplex sections<o:p></o:p></SPAN></P></DIV></DIV>
<P
style="MARGIN-LEFT: 72pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><SPAN style="COLOR: black"><o:p> </o:p></SPAN></P>
<DIV>
<P
style="MARGIN-LEFT: 72pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: 10pt">Del:<o:p></o:p></SPAN></P></DIV>
<DIV>
<P
style="MARGIN-LEFT: 72pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: 10pt"> <o:p></o:p></SPAN></P></DIV>
<DIV>
<P
style="MARGIN-LEFT: 72pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: 10pt">I
just wanted to thank you for your articulate and concise statement. My
understanding has always been that the open front counterbearing increased
the sustain in the speaking length because of the transfer of energy
back and forth across the capo. Am I reading you
correctly?<o:p></o:p></SPAN></P></DIV>
<DIV>
<P
style="MARGIN-LEFT: 72pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: 10pt"> <o:p></o:p></SPAN></P></DIV>
<DIV>
<P
style="MARGIN-LEFT: 72pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: 10pt">Paul <o:p></o:p></SPAN></P></DIV>
<DIV>
<P
style="MARGIN-LEFT: 72pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: 10pt"> <o:p></o:p></SPAN></P></DIV>
<DIV>
<DIV>
<P
style="MARGIN-LEFT: 72pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: 10pt">In
a message dated 3/15/2011 11:50:34 P.M. Central Daylight Time, <A
title=mailto:del@fandrichpiano.com
href="mailto:del@fandrichpiano.com">del@fandrichpiano.com</A>
writes:<o:p></o:p></SPAN></P></DIV>
<BLOCKQUOTE
style="BORDER-BOTTOM: medium none; BORDER-LEFT: blue 1.5pt solid; PADDING-BOTTOM: 0cm; MARGIN-TOP: 5pt; PADDING-LEFT: 4pt; PADDING-RIGHT: 0cm; MARGIN-BOTTOM: 5pt; MARGIN-LEFT: 3.75pt; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0cm">
<P
style="MARGIN-LEFT: 72pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: 10pt">1)
With an inefficient termination--i.e., a V-bar with shallow string
termination angles and "tuned" front duplex string segments on the other
side--energy can be transferred back and forth across the V-bar. Because
the duplex string segments are tuned (in theory, at least) to some
calculated partials of the speaking lengths, vibrating energy at or around
the resonant frequencies of the duplex string segments will pass back and
forth across the V-bar with relative ease. Among other things, this has
the effect of increasing the rate of decay in the desired speaking lengths
because some of the energy that is transferred across the V-bar to the
duplex string segments is absorbed into the plate at the front bearing
bar. This loss is in addition to whatever amount of energy is absorbed
into the plate at the V-bar.<BR><BR>Since the so-called "tuned" duplexes
are rarely, if ever, accurately tuned, these vibrating portions of string
can, and often do, produce sounds at undesirable pitches that are close
to, but not quite on, some harmonic of the normally speaking strings. As
well, because the string deflection angles are shallow and vibrating
energy is being transferred back and forth across the V-bar, any slight
imperfections in the shape or surface texture of the V-bar can, and often
do, create undesirable vibrations or "string noises." In an effort to
control both dissonant vibrations and the string noises it is a common
practice to mute the front duplexes. This damping absorbs some of the
vibrating energy in the duplex string segments but it does not stop the
transfer of vibrating energy coming from the desired speaking lengths of
the strings to the duplex string segment. That transfer continues but it's
now a one-way street; energy is being dampened on the duplex side of the
V-bar and is now unavailable for any transfer back into the speaking side
of the V-bar so the decay rate in the speaking string increases even more
and the sustain time further decreases.<BR><BR>2) When the string
angles are greater than about 15˚ to 18˚ and the duplex string segments
are kept reasonably short energy is not freely transferred back and forth
across the V-bar between the speaking string segments and the duplex
string segments. The termination of the speaking strings at the V-bar is
more efficient and most of the energy arriving at the V-bar is blocked and
reflected back into the speaking string segments. Some energy, to be sure,
is still absorbed into the V-bar and/or capo tastro bar but very little
makes past the V-bar it into the duplex string segments. In this case
damping the duplex string segments makes little difference because there
is little energy there to be damped. <BR><BR>As an added benefit, because
the strings are not "rocking" back and forth at the V-bar, its shape
is less critical and string noises are virtually unheard of.
<BR><BR>3) The back scale is a whole other issue. Energy is not
being transferred from the speaking strings across the bridge terminations
and to the backscale portion of the strings. The backscale is set in
motion by the motion of the bridge(s). Whether or not the backscale string
segments are tuned does not materially affect the vibrating energy in the
speaking portion of the strings or their decay rates and, hence, will have
little, if any, effect on how they vibrate or how long they vibrate.
<BR><BR>Whether tuning the backscale string segments has any positive
effect on overall piano performance is, for me, at least, an open
question. I have yet to see it conclusively demonstrated by even the most
ardent supporters of the scheme. Keeping an adequate backscale length is
clearly important but deliberately tuning the backscale to some partial
lengths of the speaking strings has long seemed an exercise in futility.
Besides, given the broad spectrum of fundamental waveforms and partials
driving the bridge(s) at any given moment (while the piano is being
played) it would be well-nigh impossible to avoid finding backscale
lengths that are not "tuned" to some fundamental or some partial of some
note or other. <BR><BR>ddf<BR><BR>Delwin D Fandrich<BR>Piano Design &
Fabrication<BR>6939 Foothill Court SW, Olympia, Washington 98512
USA<BR>Phone 360.736.7563 — Cell 360.388.6525<BR><A
title=mailto:del@fandrichpiano.com
href="mailto:del@fandrichpiano.com">del@fandrichpiano.com</A> — <A
title=mailto:ddfandrich@gmail.com
href="mailto:ddfandrich@gmail.com">ddfandrich@gmail.com</A><BR><BR><BR>-----Original
Message-----<BR>From: pianotech-bounces@ptg.org
[mailto:pianotech-bounces@ptg.org] On Behalf Of David Love<BR>Sent:
Tuesday, March 15, 2011 4:10 PM<BR>To: pianotech@ptg.org<BR>Subject: Re:
[pianotech] Tuning the duplex sections<BR><BR>Yes, that's right of course,
went too far with that idea. <BR><BR>So then why exactly does muting
the front duplex kill the tone? Even a light muting in which the
rocking motion is presumably unimpeded. What does the front duplex
contribute in that case (when it's unmated) and how does it
contribute. Similarly, why does muting the front duplex in a piano
with a very short duplex not kill the tone nor does the tone suffer,
seemingly, from having a very short front duplex. <BR><BR>David
Love<BR><A title=http://www.davidlovepianos.com/
href="http://www.davidlovepianos.com/">www.davidlovepianos.com</A></SPAN></P></BLOCKQUOTE></DIV></DIV></BLOCKQUOTE></DIV></DIV></FONT></BLOCKQUOTE></DIV></FONT></BODY></HTML>