stretch offset tables

[Hidetomo Katsura]

thanks for your suggestions.

for now, i'm trying to make something like Yamaha PT-100II without the 
partial display or analyzer (i assume). and i'm looking for the stretch 
offset tables that the user can use as reference.

katsura

On Apr 23, 2005, at 5:29 PM, DKnabe wrote:

> Katsura-san,
>
> The problem you are facing is that each piano is unique. Yes, you can 
> put in approximate stretch values for typical grands or even specific 
> models of a particular manufacturer. When you do that, and IF the 
> person doing the tuning is able to match your pitch for each note, 
> they will still not have an expert tuning.
>
> Here's the secret. Each string creates a set of partials when struck. 
> These partials are not integer multiples of the fundamental. In 
> general, each higher partial is slightly sharper than the previous 
> partial. The secret to good sounding tunings is to maximize the 
> matches between all the important partials of each string to all the 
> other strings within the constraints of somewhat equal temperament 
> (12th root of 2). So, to match an expert piano technician, your tuning 
> program should measure each partial of each string, and then do a best 
> fit of the most important partials (loudest, etc) so that the piano 
> sounds as smooth as you can get it. This is what aural tuners do, and 
> that is also what the best electronic tuners strive to do.
>
> To see how others have solved this problem, go to their web sites. See 
> www.veritune.com/, or http://www.tunelab-world.com/ or 
> http://www.accu-tuner.com/. There are other professional electronic 
> tuners out there as well.
>
> My recommendation is that if you are really serious about making a 
> professional tuning program, you should join the Piano Technicians 
> Guild and learn about the instrument. You can take tuning classes at 
> many local, regional and national conventions. The National convention 
> is June 15-19 in Kansas City.
>
> Good luck,
> Doug Knabe
> Dallas
>
> Hidetomo Katsura wrote:
>
>> thanks. i forgot to mention that i knew about the stretch tables on 
>> the  Peterson 490ST manual and three piano model specific stretch 
>> tables at  precisionstrobe.com (fyi, i did use google).
>>
>> i'm looking for something more specific to each piano manufacturer 
>> and  model (like the ones at precisionstrobe.com).
>>
>> katsura
>>
>> On Apr 23, 2005, at 2:35 PM, Benny L. Tucker wrote:
>>
>>> This pdf manual for a Peterson Strobe Tuner is available for 
>>> download  at the
>>> link below. It lists the offsets for the fundamental frequencies for 
>>>  several
>>> different piano styles. I use this tuner myself to intonate guitars  
>>> with.
>>> You may have to copy and paste the link into your browser if it gets 
>>>  chopped
>>> up in the email.
>>> Hope this helps.
>>>
>>> http://www.petersontuners.com/support/pdfmanuals/PDF%20Manuals/ 
>>> Strobe%20Tune
>>> rs%20-%20True%20Mechanical/AutoStrobe/AutoStrobe%20490ST/ 
>>> 490stenglish.pdf
>>>
>>> Benny L. Tucker
>>> Yamaha Factory Tuner
>>> Precision Piano Tuning & Repair
>>> Thomaston, Ga.
>>>
>>>
>>> i see. it's my own ETD i developed based on the popular requests from
>>> my Strobe Tuner users.
>>>
>>>    Piano Tuner 1.0 for Mac OS X
>>>
>>>    http://www.versiontracker.com/dyn/moreinfo/macosx/26163
>>>
>>> my stretch offset table data format is just a text file with note 
>>> names
>>> and offsets and looks like this:
>>>
>>> "A0"="-20.000";
>>> "Bb0"="-19.000";
>>> "B0"="-18.000";
>>> "C1"="-17.000";
>>> "C#1"="-16.000";
>>> "D1"="-15.000";
>>>
>>> katsura
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> pianotech list info: https://www.moypiano.com/resources/#archives
>>>
>>
>> _______________________________________________
>> pianotech list info: https://www.moypiano.com/resources/#archives
>>
> _______________________________________________
> pianotech list info: https://www.moypiano.com/resources/#archives
>