pitch drop :was Virgil's natural beats

[Murray Seminuk]

Hi Ron
This is really difficult to pin down without knowing what each other is
listening to.Do you mean that when you add the second string to the
first,that as it is coming into tune that you hear the "sound" of the two
strings drop?To me ,that would be the increase of the sound of the
fundemental of the note rather than the sound of one of the higher partials
dominence of the total sound.Are we still talking about different things?

Murray


----- Original Message -----
From: "Ron Nossaman" <RNossaman@KSCABLE.com>
To: <pianotech@ptg.org>
Sent: Wednesday, February 14, 2001 9:01 PM
Subject: Re: pitch drop :was Virgil's natural beats


> >Hi Ron
> >This can vary from pianao to piano, but I do see a regularity of this
> >happening .The two notes on either side of the treble strutt seem to be
very
> >sensitive
> >to an increase in tension ,and usually need a few passes to settle
down.This
> >is also in the area of the sharpe bend in the bridge(Grand).Do you think
> >this could have an effect?With a slight humidity change ,this is an area
> >that is always effected.
> >
> >Regards
> >Murray
>
> Hi Murray,
> Yes, but what we're talking about is something altogether different. When
> tuning a unison, the apparent pitch drops as the second and third string
is
> added in. Mute those strings, and the first string is still at pitch. Open
> the strings again and the unison pitch again drops, even though the unison
> is in tune within itself. Very strange. This happens mostly in the killer
> octave area. Yes, that's where the sharpest curve is in the bridge, but
> that's also where the "tuned" front and rear duplexes start. I think the
> bridge curve is contributory to the long term tuning instability in that
> area, as well as soundboards tending to go flat there first, but not to
> this unison pitch drop effect which happens immediately upon tuning in the
> second string of the unison.
>
> Ron N
>