[pianotech] Was high and outside now silent pitch lowering

[Terry Farrell]

> Which Sanderson do you use? With the SAT3 you only have the option of 25% or 33(?)%. 

I use the Sanderson pitch raising method - leapfrogging two mutes, unisons as I go, A0 to C88. I do not use an AccuTuner. I do use Verituner for iphone.

> In most pianos, for smaller pitch raises I hardly overpull the bass at all. If it's a big PR (e.g. 40c-50c or more) even then 25% is too much in the bass.  

I agree that 25% would be too much. That's why I've settled on about 16%.

> I find that the 33% overpull in the top two octaves or so is oftentimes not enough. In order to compensate for these, I usually compensate on the "Msr" by going more flat (treble) or less flat (bass) before having it calculate the overpull. I re-"Msr" every C#, F, and A (M3's)

I agree that 33% would often be too little overpull, which is why I have settled on about 38%.

> I strip mute, A0 - C8, unisons (center, previous note right, current note left, next note center, etc.) as I go... someday I'll get brave and try a single mute. Maybe. 

I effectively do the same thing, only with two mutes.

> I've always been tempted to investigate this, but does it really overpull that much at the very top? In other words, if I overpull C8 by 33%, what's to pull it flat, besides the other two C8 strings? Or are the other two strings enough to drag it back down? 

No, of course not. I usually decrease the overpull on the last few notes. Let's say I'm doing a 55-cent pitch raise - the 38% overpull should be about 20 cents. I would overpull A8 and all notes below about 20 cents. I would likely aim for 15 cent overpull on A#8, 10 cent overpull on B8 and only 5 cent overpull on C8. I also find that I'll decrease the calculated overpull on the last note or two in the upper tenor and bass. In the low tenor I will increase the overpull by maybe 10% of the calculated overpull. And in the monocord section of the bass, I'll usually double the overpull (about 30%). I just find that these few tweaks usually get me closer to the ultimate target in the end.

Terry Farrell

> 
> Paul Bruesch
> Stillwater, MN
> 
> On Tue, Oct 30, 2012 at 6:22 AM, Terry Farrell <mfarrel2 at tampabay.rr.com> wrote:
> I find it curious how folks find differing overpull percentages working for pitch raises. For me, I've settled on 16% in the bass, 28% in the tenor and 38% in the treble. Seems to work just about right on most any piano. I use the Sanderson method: A0 to C88, unisons as you go.
> 
> Terry Farrell
> 
> On Oct 30, 2012, at 12:44 AM, Cy Shuster wrote:
> 
> > Good question! Answer is rarely.
> >
> > TuneLab has a safety limit for maximum overpull percentages. You tell it where the treble bridge starts, and you get one limit for the bass, another for the treble (slight differences between old Windows and new iOS/Android versions). I limit the bass to 10%, and treble to 25%.
> >
> > --Cy--
> >
> > Cy Shuster, RPT
> > Albuquerque, NM
> 

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