FAC numbers

[Jim Coleman, Sr.]

Hi Jim:

Since the F4 stretch number gives you a tuning only from C3 to F6, you
have to tune the notes F#6 and above based either on partials of the 
already tuned F#5 or F#4 (ie attached to the main body of notes already
tuned). This procedure is followed all the way up to note C8. After tuning
in the Stretch mode from C3 to F6, touch the TUNE button to go beyond the
F6 to F#6. Play F#4, adjust the cents buttons to stop the LEDs which may
be rotating slightly. The machine is reading the 4th partial of F#4. Then
when you tune F#6 to this setting, you will have a perfect double octave.
This will be a slightly sharper tuning than you would get if you played
the F#5 note and stopped the LEDs to match the F#6 to the 2md partial of 
F#5. I personally prefer the matched double octave rather than the matched
single octave. After you have tuned F#6, advance the machine to G6, play
the G4, stop the LEDs, tune the G6 to that setting. Continue in like fashion
to the C8.

To pigtail the upper Bass to the Stretch tuning below C3. After descending 
to the bottom of the Stretch mode at C3, to go below C3, you need to 
touch the TUNE button. This will show that the SAT I was really listening 
to C5 when you tuned the C3. Now you can hit the NOTE Down button to 
drop to B4 which was already tuned in STretch mode. With the Cents buttons,
stop the LEDs rotation. Now you can tune the B2 2nd partial to this setting.
It will give you a perfect double octave with B4. This is what we call 
4-1 octave matching. I prefer to tune the Bass of most pianos using the 6-3
octave matching where the 6th partial of B2 (at F#5) will be tuned to the
3rd partial of B3 (F#5). Here's how to do it. Play the B3 note with the
SAT set to F#5 in the TUNE mode. Stop the LEDs with the CENTS UP/DN buttons.
Then tune B2 to that setting. This will give you a B2-B3 octave where the
standard minor 3rd-Maj 6th tests will be equal (ie B2-D3 beats the same as
D3-B3).

For those who still use the older Sight O Tuner (SOT for short) the same
principles apply. The upper treble is pigtailed onto the previously tuned
Stretch tuning derived from the Stretch Calculator card. To tune the F#6,
play the already tuned F#4, stop LED rotation using the Fine or Coarse
knobs, then tune F#6 to that setting. continue in like manner all the way
to the C8.

Similarly in tuning below the C3, set the note/oct switches to F#5 
(which is the 3rd partial of the already tuned B3), stop the LEDs with the
Fine and/or Coarse Cents knobs, Tune the B2 to stop the LEDs. Change the
note selector to the next half step lower (F5), play A#3, stop LEDs, tune
A#2 to stop dots. continue like this all the way down to A0.

This may be more than you asked for, but it may help others who needed
a little more detail.

Jim Coleman, Sr.


On Mon, 24 Aug 1998 Jlovekeys@aol.com wrote:

> 
> "For a few strange pianos the F4 stretch number works better, but then you
> have to pigtail on the treble and Bass".  Please explain the term "pigtail" on
> the treble and bass?  thanks. Jim Love, PTG associate, Midland,Tx. 
>