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<DIV><SPAN class=035412909-17082004><FONT face=Arial color=#0000ff =
size=2>Bernhard hello,</FONT></SPAN></DIV>
<DIV><SPAN class=035412909-17082004><FONT face=Arial color=#0000ff =
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=035412909-17082004><FONT face=Arial color=#0000ff =
size=2>Can't
be that these blows are not exactly synchronized ((what happens not at =
all level
of play I guess anyway) but key bottom stroke prorogated by =
backchecks
stroke inducing a energy wave toward the bridge and hence adding to the =
string
energy) ?</FONT></SPAN></DIV>
<DIV><SPAN class=035412909-17082004><FONT face=Arial color=#0000ff =
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=035412909-17082004><FONT face=Arial color=#0000ff =
size=2>High
speed analysis should certainly be interesting for that matter, but a =
simple
time spectra analysis can yet show us things. The device used for the =
test blows
at the PTG seem a good one for that kind of test.</FONT></SPAN></DIV>
<DIV><SPAN class=035412909-17082004><FONT face=Arial color=#0000ff =
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=035412909-17082004><FONT face=Arial color=#0000ff =
size=2>I am
persuaded also that the stiffness of the wire being stiffer with a =
lower
backchecks the checking stroke is firmer.</FONT></SPAN></DIV>
<DIV><SPAN class=035412909-17082004><FONT face=Arial color=#0000ff =
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=035412909-17082004><FONT face=Arial color=#0000ff =
size=2>The
impression to have the fingers touch the strings (via the hammer I =
guess) is
what I focus on while tuning , one of the reasons why I tune differently =
depending of the amount of aftertouch (unconsciously very
probably).</FONT></SPAN></DIV>
<DIV><SPAN class=035412909-17082004><FONT face=Arial color=#0000ff =
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=035412909-17082004><FONT face=Arial color=#0000ff =
size=2>This
impression exist as well with a less synchronized checking, but indeed =
any tip
that reinforces it is a very good one.</FONT></SPAN></DIV>
<DIV><SPAN class=035412909-17082004><FONT face=Arial color=#0000ff =
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=035412909-17082004><FONT face=Arial color=#0000ff =
size=2>Thanks
for your participation !</FONT></SPAN></DIV>
<DIV><SPAN class=035412909-17082004><FONT face=Arial color=#0000ff =
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=035412909-17082004><FONT face=Arial color=#0000ff =
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=035412909-17082004><FONT face=Arial color=#0000ff =
size=2>Best
Regards.</FONT></SPAN></DIV>
<DIV><SPAN class=035412909-17082004><FONT face=Arial color=#0000ff =
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=035412909-17082004><FONT face=Arial color=#0000ff =
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=035412909-17082004><FONT face=Arial color=#0000ff =
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=035412909-17082004><FONT face=Arial color=#0000ff =
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=035412909-17082004><FONT face=Arial color=#0000ff =
size=2></FONT></SPAN> </DIV>
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT =
face=Tahoma
size=2>-----Message d'origine-----<BR><B>De :</B> =
pianotech-bounces@ptg.org
[mailto:pianotech-bounces@ptg.org]<B>De la part de</B> Bernhard
Stopper<BR><B>Envoyé :</B> mardi 17 août 2004 =
09:50<BR><B>À :</B>
Pianotech<BR><B>Objet :</B> Re: back check, a magical mystery
tour.<BR><BR></FONT></DIV>
<DIV><FONT face=Arial size=2>Hello All,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>the energy of the hammer returned to =
the backcheck
and the energy of the key to the keyframe become synchronous with =
the said
2 milimeters. If this two blows are synchronized, there is a higher =
pulse wave
running through the instrument giving more additional energy to the =
string than
when this two blows are time offset (and may cause phase =
losses when
reaching the string).</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>As a second effect of this two blow =
synchronization
at the 2 milimeters s that the player gets the impression when he =
reach the
key bottom (what produces a reaction force on his finger) and the blow =
of the
hammer backcheck (what produces also a reaction force on his =
finger) that
he touches the string with his fingertips what gives him more
inspiration while playing.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>kind regards,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Bernhard Stopper</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>
<A title=antares@euronet.nl =
href="mailto:antares@euronet.nl">antares</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A =
title=pianotech@ptg.org
href="mailto:pianotech@ptg.org">Pianotech</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, August 16, 2004 =
9:36
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> back check, a magical =
mystery
tour.</DIV>
<DIV><BR></DIV>Hello List, Avery, Stephane and Richard,<BR><BR>I have =
written
about this mystery issue before a long time ago. I personally have no
explanation for it.<BR>I just learned this from a very gifted Japanese =
teacher. he introduced me to "the one and only right position" of a =
back check
versus hammer tail.<BR>According to him (Tsuji-san), there should be a =
space
of 2 mm <B>after drop</B> between hammer tail and back =
check.<BR>Indeed that
is true, and it is a mighty weapon.<BR>Throughout the years, there =
have been
many miracles described on this list to improve tone and action.<BR>If =
we
delve into all what has been said, we must come to the conclusion =
that, to
achieve the very best in regard to the way an action performs and to =
get the
ultimate outcome...the tone, our profession is extremely =
complex.<BR>The
mystery of the back check has not been solved yet. I have as of yet =
not heard
an explanation that totally convinces me. Nor was Tsuji-san able to =
explain it
to me.<BR><BR>A <B>very</B> powerful regulation is one thing, to make =
a
<B>fantastic</B> tone another.<BR>Among the weapons we are able to =
employ are
: <BR>1. Our experience, talent, knowledge and understanding first of
all<BR>2. The use of high quality materials like : the best felt and =
the best
front punching (indeed heavily underestimated)<BR>3. A thorough =
understanding
of the use of anti-friction material, and what it really means<BR>4. =
The
ability to make a superb concert tuning<BR>5. The ability to bring a =
voicing
to a high standard.<BR><BR>As described above, the back check height =
belongs
to this list. It is a very handy help in the voicing process.<BR>We =
start this
process with the usual list, like anti-friction treatment, regulation, =
tuning
and voicing, but we can improve the final outcome with the help of =
this back
check phenomenon.<BR>To give you a clear example :<BR>A long time ago =
I had to
prepare a number of instruments for customers in the showroom of =
Yamaha in the
Netherlands.<BR>After a few rounds, one C5 grand was their favorite, =
but they
explained to me that still <I>something</I> was missing.... it was =
<I>just not
</I>powerful enough.<BR>My piano instinct told me to do the one and =
last thing
: I told them to have another cup of coffee (yes Huber Liverman!) and =
I also
told them that I knew exactly what they meant.<BR>This was partly =
true, but
also bluff on my side, but under the circumstances, my professional =
life was
on the block.<BR>I got out my Japanese tool to change the height of =
the back
checks and I started twisting and turning the back checks to the =
desired
height.<BR>On the way I broke one of the back checks but was so =
extremely
lucky to be able to replace it immediately and without their seeing =
any of it
(they were busy slurping their adrenalin).<BR><BR>After 10 minutes, I =
wiped
the sweat from my brows and joined them for my round of the brown =
stuff, and I
told them that I thought I had successfully solved their
complaint.<BR><BR>They went back and played the C5, <B>and bought it
immediately!!<BR><BR></B>Thanks to the generous lesson of
Tsuji-san.<BR><BR><BR>André Oorebeek<BR><BR><BR><BR>On 16-aug-04, at =
8:27,
Richard Brekne wrote:<BR><BR>
<BLOCKQUOTE>Hi Avery<BR><BR>In the case of the grand at the =
University, they
were higher then what turned out to be best for the sound. I am not =
sure
whether they can be too low in this regard. Andre is following the =
whole
thread so I am sure he can answer better.<BR><BR>btw... I've heard =
the
standard set both 2mm above and 2mm below the hammer tail at let-off =
through
the years. Quite a few times both ways actually. It would be nice to =
hear
what the consensus is here.<BR><BR>Cheers<BR>RicB<BR><BR>Avery Todd
wrote:<BR><BR>
<BLOCKQUOTE>Ric,<BR><BR>Just curious. Is Andre referring to the =
backchecks
being higher than normal<BR>(2 mm below the hammer tail at =
let-off), or
lower?<BR><BR>Avery<BR><BR>
<BLOCKQUOTE>This brings me to another one of Andre's =
suggestions... that
about the height of the backcheck having an impact on tone. Now =
this one
is just plain weird sounding... I'll be the first to admit it... =
but
there it was. When Andre was up here a couple years back he =
demonstrated
it to 5 of us, and no one could avoid admiting that he'd changed =
the
tone... the openess of the tone on the notes he'd adjusted. I =
asked the
famous Japanese pianotechs Mr. Ono and Mr. Takahara about this =
too
whilst I was in Japan this summer, and they both immediatly =
responded
along the lines... "but of course-- didnt you know that ???"... =
tho to
this day I have yet to find a satisfactory explaination for why =
the
height of the backcheck can influence the openess of the tone of =
the
=
piano.<BR></BLOCKQUOTE><BR><BR>__________________________________________=
_____<BR>pianotech
list info:
=
https://www.moypiano.com/resources/#archives<BR><BR></BLOCKQUOTE><BR>___=
____________________________________________<BR>pianotech
list info:
=
https://www.moypiano.com/resources/#archives<BR><BR><BR></BLOCKQUOTE>fri=
endly
greetings <BR>from<BR>André Oorebeek<BR><BR>Amsterdam -<BR>The
=
Netherlands<BR><BR>www.concertpianoservice.nl<BR>www.grandpiano.nl<BR><BR=
>"where
music is, no harm can be"<BR></BLOCKQUOTE></BODY></HTML>