FAC database

[bases-loaded@juno.com]

Del -

Thanks so much for explaining Ron Berry's approach to adjusting the FAC
stretch numbers.  Sounds like a good method.  I'll try it out tomorrow.

Mark Potter
bases-loaded@juno.com

On Mon, 15 Nov 1999 09:41:14 -0500 "Del Gittinger" <delgit@acc-net.com>
writes:
> Mark & all,
> 
> My apologies to Ron Berry if I get this wrong:
> 
> I measure FAC stretch numbers as usual and create the tuning in a 
> memory slot.  I tune A4 then move the SAT to A6 and play A4.  At A6 
> the SAT is listening to the fundamental of A6 as determined by the 
> calculated tuning.  If playing A4 stops the lights at A6 my stretch 
> for that string is correct. But, the octave temperament octave 
> stretch may not be.
> 
> Then I tune B4 and C5 per the calculated tuning. The FAC tuning 
> changes partials at C5.  To be sure the octave stretch is good for 
> this piano I play B4 with the SAT set on F#4 and observe how fast 
> the lights rotate sharp.  Then play C5 with the SAT set on G4 and 
> observe the lights again.  The speed for both notes should be about 
> equal for a smooth transition across the breaks.  If B4 is faster 
> then lower your A4 number and recalculate.  And the opposite if it 
> is faster.
> 
> As usual, the good, well scaled pianos don't need this extra step 
> very often.  It's the others that require this extra step.
> 
> I hope this helps.
> 
> Del Gittinger, RPT
> Del's Music Studio, Marion, OH
> Piano Tuning & Service
> Electronic Instrument repairs including organs
> delgit@acc-net.com
>