Sanderson Accu-tuner

[Paul McCloud]

Hi, Barrie:
 I refer you to the manual for the SAT III.   
http://www.accu-tuner.com/pdfs/2006_SAT_III.pdf
Check the table of contents and scroll down to the double octave beat description.  If you go to the Inventronics website, there is a lot of information regarding the SAT's.  
The SAT calculates a stretch according to 3 notes on the piano, F3, A4 and C6.  If you find that the result is not satisfactory, you can alter the stretch using the D.O.B. (Double Octave Beat) button, either before calculating the tuning, or during the tuning process "on-the-fly".  Only the new SAT III's have this feature.  However, the older SAT machines can also be programmed to provide more stretch, using a method developed by Jim Coleman, Sr.  This must be done while measuring the piano for the 3 calibration notes, F, A, and C.  Without a machine in your possession, it would be difficult for me to explain exactly how it is done.  
I'm sure the other computer-based machines can also alter their stretch curves to suit your ear.  
Of course, you can always tune the center octave, and tune the rest by ear.  
Best regards,
Paul McCloud
San Diego

> [Original Message]
> From: Barrie Heaton <piano at a440.co.uk>
> To: <pianotech at ptg.org>
> Date: 06/10/2007 4:38:07 AM
> Subject: Re: Sanderson Accu-tuner
>
> In message <011101c7aacb$13d8b240$6601a8c0 at PAUL>, Paul McCloud
> <service at pianosd.com> writes
> >Barrie:
> >       I don't have the SAT III, so those features aren't in mine.  The
> >new unit has a feature that allows one to change the stretch on-the-fly, rather
> >than relying upon the initial calculation.  I don't know about the RPT exam
> >feature.  Maybe others could explain that one.
> >       Paul McCloud
> >       San Diego
>
> Thanks Paul
>
> it was just the  double octave beat thing   so I take it if you don't
> observe your octaves when tuning,  you could end up with beats in the
> double octave.   So you have to tweak the SAT as you tune to end up with
> a tuning you and your client are happy with it, is that about right. If
> so,  Is this the case for all ETD ?
>
>
> Barrie,
>
> -- 
> Barrie Heaton      PGP key on request           http://www.a440.co.uk/
> AcryliKey Ivory Repair System UK ©              http://www.acrylikey.co.uk/
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