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#2242887 - 03/07/14 09:18 PM Question About Over-Pull In Tune Lab
JMichaelWilson Offline
Full Member

Registered: 05/01/09
Posts: 104
Loc: Tennessee, USA
When using the over-pull mode in Tune-Lab, once the pre-measurements are made and you begin Over-Pull tuning, do you pull each note up to the Over-pull offset amount shown in the right hand box or do you just tune the note to the center red line of the spectrum?
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Tuner/Technician, Associate Member PTG, Certified Installer Piano Life Saver Systems

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#2242896 - 03/07/14 09:36 PM Re: Question About Over-Pull In Tune Lab [Re: JMichaelWilson]
Robert Scott Offline
Full Member

Registered: 12/19/03
Posts: 292
Loc: Minnesota
The red line in the center has already been offset by the amount shown, so if you just tune as you would normally, you will automatically be getting the over-pull offset.
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Robert Scott
Hopkins, Minnesota
http://www.tunelab-world.com

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#2242934 - 03/07/14 10:44 PM Re: Question About Over-Pull In Tune Lab [Re: JMichaelWilson]
Mark Cerisano, RPT Offline
1000 Post Club Member

Registered: 01/24/10
Posts: 1849
Loc: Montreal, Quebec, Canada
Here's my question: how does Tunelab know if the soundboard is flat or crowned? A flat soundboard does not need as much over pull.
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Mark Cerisano, RPT
www.howtotunepianos.com

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#2242947 - 03/07/14 11:15 PM Re: Question About Over-Pull In Tune Lab [Re: JMichaelWilson]
Emmery Offline
2000 Post Club Member

Registered: 04/02/08
Posts: 2481
Loc: Niagara Region, On. Canada
Mark, RCT has a pitch raise function which works excellent and it follow a similar principle to Tune Lab's, I believe. The software does not know the condition of the soundboard but in RCT, you can adjust the standard default overpulls by reducing or increasing the percentages. These percentages are spread in several areas usually between the bass/tenor/treble breaks which you define before you begin. A quick check with a downbearing gage might be all that is needed to decide on what overpull percentages to go with. I've never needed to adjust for this myself, but there are certain types of pianos I back away from the recommended overpulls on the top half octave in the treble or else it ends up too sharp.

This adjustment on percentages also prevents exxcess string breakage on old pianos or large pitch raises. 35-40% of overpull in the treble might be too much on rusty old strings.


Edited by Emmery (03/07/14 11:19 PM)
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