ETD question re: unisons

[Ron Nossaman]

>Tom:  If I'm not mistaken, the wapin bridge claims better sustain  as it's
>primary value.  It follows then that due to bridge impedance a vertical
>vibration will result in a short sustain, a circular vibration a medium
>sustain and a horizontal vibration will have the longest sustain.
>
>Now if you can shorten the time that vertical vibration takes place, more
>energy is available to increase the duration of the medium sustain of the
>circular vibration.
>If that is in fact true that the wapin bridge accomplishes that, I can see
>that may be why it improves sustain.  It may be taking energy at the
>beginning or(prompt sound) and transferring it to the aftersound.  That may
>be a good thing and may sound better, but I can't yet visualize how that
>happens when you straighten up the bridge pin.
>
>I suspect that if the string goes circular immediately, it will remain so
>only for a short time.  However,  by that time the pianist will have decided
>to hit some other note, so it doesn't matter.
>
>Velly interesting.
>
>Carl Meyer

Yes it is, since I was under the impression the intent of the Wapin system
was to keep the string excursion vertical, so what string energy there was
would be more directly and efficiently transferred to the board.


Ron N