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Hi Jason,<br>
Back up a moment, the topic was originally noisy and aggressive capo
bars, tuning duplexes is a whole different topic.<br>
Most are designed to be de tuned, and on rear duplexes,
which only add a marginal amount to the tone quality, if all three
strings are singing at the same pitch, that's usually good enough. <br>
With sectional duplex bars, there's not a lot the average tech can do,
other than rub them out so they are even.<br>
Most forward duplexes are cast in the plate and again, it's limited as to
what can be achieved.<br>
When voicing, you aim for the forward duplex to sing but not sing
through, so as to be obnoxious, and obvious.<br>
Next is to make sure the strings are rendered evenly, with lots of
plucking and re tuning.<br>
To raise the pitch of the rear duplex, rub down the speaking length of
the string with a hammer shank, or brass rod, then re tune. To
lower the pitch rub out the duplex and hitch pin segment, then re tune.
then compare the 3 duplex strings, then start again. It is a slow a
laborious job.<br>
With the front duplex, rubbing or seating it, will make the speaking
length go sharp, Often at this end, friction and rendering is the cause
of problems, along with the design. I have de tuned many a forward
section with a little dab of white glue to add mass to that string
segment. It will still sing, but not be annoying, and not dead like
adding felt,<br>
Ron Overs piano, is the best I have seen to date, that has control over
the duplex voice. Each note has a movable bearing bar. A
piano like this is sure worth spending a lot of time on.<br><br>
Is this what you were looking for?<br><br>
Regards Roger<br><br>
At 06:04 PM 9/3/02 -0700, you wrote:<br>
<blockquote type=cite class=cite cite><font size=2>Thanks, all, for
responding. But I'm puzzled ... the duplex is there for a design reason,
after all, which I presume is to create additional harmonics and add to
the esthetic quality of the tones. Sounds like the universal consensus is
that the duplex is generally more trouble than it's worth. *Not one* of
you ever retunes the duplex??? (I say this without yet having checked the
archives for Ron Overs on "detuning the duplex" but the title
appears to substantiate my guess here.)</font></blockquote></html>