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<DIV>Carl:</DIV>
<DIV> </DIV>
<DIV>FYI, the patent holder of Wapin is the University of Cincinnati. The
Wapin LLP is only a clearing house for them on this. U of C would have to
reexamine this issue for the cost to change. </DIV>
<DIV> </DIV>
<DIV>I participated in Wapinizing of a 6'4" Knabe a few weeks ago. While
doing the work, we discussed how this works, why it helps, what's really
happening to the string. The bottom line is we don't know. It did
make a difference in the piano, but I couldn't begin to guess why.</DIV>
<DIV> </DIV>
<DIV>dave<BR><FONT face=Arial size=2>*********** REPLY SEPARATOR
***********<BR><BR>On 2/17/01 at 7:08 PM Meyer Carl wrote:</FONT></DIV>
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<DIV><FONT size=2>Thanks to Tom Cole, Ron Nossaman, and Richard Brekne for
responding to my post.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>This is a real can of worms. I'm still fishing,
even if my license has expired.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2>I've just spent some time looking at the wapin.com
site. They say that wapin improves sustain. </FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2>Okay, Ron, if you think that it is supposed to keep
the string vibrating vertically, then the sustain must be less.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2>I'm not sure exactly what some of the parameters of the
curves they show mean, but one important factor is missing. The HP
dynamic signal analyzer, I'm not familiar with. I'll call HP
Monday and find out. The factor that is missing is time. The curve
of the wapin piano in log mode shows all partials out to number 39 and then
stops. The note used is d3. The 39th partial is 5726 Hz
theoretically, but stretch may make it much higher.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2>Now, I would like to know the time that the reading was
taken. From time zero (when the hammer hits the string) amplitude of the
partials vary dramatically as they phase in and out. A plot of the level
of partials versus time would be very meaningful. A plot of each partial
versus time would get tedious, but a plot similar to Weinrichs giving the
overall loudness of the total signal would give us the answer to what the
decay would be. </FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>I suspect the graph shown of the wapin piano averages the
amplitude over a time period. For it to be meaningful we need to know what
that time period is.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Richard, I wouldn't fret that you're not an acoustic
professor. Nothing will destroy your common sense faster than a formal
education unless it would being elected to public office. Do you really
think that those that have access to that fancy equipment have the mind to use
it?</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Fascinating subject to be sure. My interest is fueled
by the obscene charge to license wapin.</FONT></DIV>
<DIV><FONT size=2>Nothing would delight me more than finding a way to equal or
improve on wapin with out infringing on their patent.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Keep those cards and letters coming in.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Carl Meyer</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2></FONT> </DIV>
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<FONT size=3>David M. <FONT color=#000000
face="Times New Roman">Porritt</FONT></FONT></DIV>
<DIV><FONT size=3><A
href="mailto:dporritt@swbell.net">dporritt@swbell.net</A></FONT></DIV>
<DIV><FONT size=3>Meadows School of the Arts</FONT></DIV>
<DIV><FONT size=3>Southern Methodist University</FONT></DIV>
<DIV><FONT size=3>Dallas, TX 75275</FONT></DIV>
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