Unison Flatter than each Individual string?

[Richard Brekne]

Hi 

baoli liu 

I kind of get the feeling that both the soundboards
vibrational modes as you point out, and also the condition
of the bridge gets into the picture. How springy or massy
the impedance characteristics are at the bridge, even before
the soundboard modes get into the picture may come into
play. For that matter the condition of the bridge pin
(whether its tight or loose in the bridge) might play some
role.

In any case, I cant say that I have been able to observe
that string coupling results exclusively in pitch drop.
Actually I am not sure that this pitch drop happens
significantly more often then other things.

On the side, it seems more and more to me that both pitch
decay and and whether the pitch rises or falls in coupling
also have something to do with coincident partials to the
note being played. I find what looks very much like
increased sustain especially in the high treble when I use
the perfect 12ths tuning. And it also seems to be that when
this "extra" sustain is most apparent, the unison displays a
slight rise in pitch as as it decays. Weird.

But like I say, I believe the whole subject matter is not
completely understood, and that like our understanding of
just how the soundboard vibrates and other such subject
matter, lots more hard research and experimentation is
needed. 

RicB