Overpull

[Don]

Hi Bradley,

Please define close. I prefer the term pitch correction because we
sometimes do have to lower pitch and an over pull is required in the
direction of the pitch change.

Yes there is a pitch drop and yes it can be predicted. How does a pitch
correction of 220 cents at A4 with a single pass tuning leaving A4 1.21
cents sharp sound? Is that close enough? Not for a concert tuning but for a
client with not much money it is ok.

Most of the pitch change while tuning is due to the plate flexing. Yes the
note a semitone away has more effect than the note a 4th away--but the note
3 octaves away *also* has an effect.

At 05:14 PM 3/28/02 -0800, you wrote:
>I really hesitate asking what makes the pitch drop, because my interest is
>not about whether the plate or bridge is flexing. Assuming that these are
>not new strings, can we actually predict how much the pitch will drop during
>a pitch raise? How much do surrounding strings effect a note that is being
>moved. I assume that a half step away is more influential than a note a
>fourth away.
>
>Lets say we are not really doing a pitch raise, but the stretch that was
>applied to the piano necessitates moving some of the notes as much as 20
>cents. If we know exactly where all the notes are, and we know exactly where
>we want the notes to end up, is there a way to accurately calculate how much
>overpull is needed for each note? Understandably there will be factors
>involved that are hard to predict, but is there a way to get really close?
>
>Bradley M. Snook


Regards,
Don Rose, B.Mus., A.M.U.S., A.MUS., R.M.T., R.P.T.

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