Inventronics SANDERSON ACCU-TUNER IV User manual

SANDERSON
ACCU-TUNER
♦
IV
OPERATING MANUAL
INVENTRONICS, INC.
130 MIDDLESEX RD, Suite 14
TYNGSBORO, MA 01879-2725
www.Accu-Tuner.com
[e-mail]
1-800-FAST-440
Outside USA/Canada CALL 978-649-9040

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WRITTEN BY:
PAUL L. SANDERSON
DR. ALBERT E. SANDERSON
WITH SPECIAL CONTRIBUTIONS BY:
RICK BALDASSIN
JAMES W.COLEMAN, SR
THIS MANUAL IS COPYRIGHTED. ALL RIGHTS ARE RESERVED. THIS DOCUMENT MAY
NOT, IN WHOLE OR PART, BE COPIED, PHOTOCOPIED, REPRODUCED OR TRANSLATED
WITHOUT PRIOR CONSENT IN WRITING FROM INVENTRONICS, INC.
©2009 INVENTRONICS, INC.
TYNGSBORO, MA 01879

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INTRODUCTION................................................................................................... 5
GETTING STARTED ............................................................................................. 5
BATTERY STATUS INDICATOR.............................................................................. 6
CALIBRATION ............................................................................................................. 6
THE THREEMODES OF OPERATION............................................................... 6
THETUNE MODE.......................................................................................................... 7
THE MEMORY MODE................................................................................................. 8
RANGE OF MEMORY MODE ............................................................................................8
TUNING FROM MEMORY.................................................................................................9
PAGE NUMBER DISPLAY..................................................................................................9
FAC TUNINGS...............................................................................................................10
MEASURING AND STORING THE FAC NUMBERS....................................... 10
BASIC METHOD ........................................................................................................10
FAC TUNING PARTIALS..............................................................................................11
A QUICK METHOD FOR STORING STRETCH NUMBERS..........................12
REVIEWING THE FAC NUMBERS........................................................................12
VIEWING FAC NUMBERS FROM A PAGE IN MEMORY ...............................................13
COPY AND PASTE AN ENTIRE PAGE OF MEMORY ......................................................13
OFFSETTING AN FAC TUNING TO NON-STANDARD PITCH.......................................13
CENTS OFFSET FOR HZ AT A4.......................................................................................14
FAC TUNING FROM A0 TO C8.....................................................................................14
UNISON TUNING.............................................................................................................14
ONE STRETCH NUMBER MEASUREMENT FOR TUNING........................... 15
USING THEA4 STRETCH NUMBERMULTIPLIER......................................... 16
AUTO NOTE STEPPING..................................................................................... 17
BACKLIGHT ON THE DISPLAY........................................................................ 17
USING THE HELP FUNCTION........................................................................... 18
MENUFOR NEWFEATURES............................................................................. 18
SWAP DOB & CENTS.................................................................................................18
DISPLAYING THE NOTE/OCTOREUROPEAN......................................................18
“A “ MULTIPLIER DEFINITION ..................................................................................19
TEMPERAMENTS ............................................................................................................19

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AUTO STEPPING ADJUSTMENT...................................................................................19
LAMP DEFAULT..........................................................................................................20
NEW FEATURES NOT IN THE MENU SECTION ............................................ 20
EDITING HEADERS FROMTHE KEYBOARD OF THE ACCU-TUNER IV ..................20
SIGNAL STRENGTH GRAPH OR HEADERLISTING.................................................20
PITCH RAISING................................................................................................... 20
CUSTOM PITCH RAISE..................................................................................... 21
THEMEASURE(MSR) BUTTON....................................................................... 22
THERESET (RST) BUTTON.............................................................................. 22
RESETTING TO NON-STANDARD PITCH........................................................................22
PERFECTING THE A-440 OF STRETCH TUNING...........................................................22
DISPLAYING THE CENTS OFFSET...................................................................................23
MEASURING THE WIDTH OF MUSICAL INTERVALS.....................................................23
QUICK RESET OF CENTS DISPLAY TO ZERO.............................................. 23
WARM STOP........................................................................................................ 24
ADJUSTING THE DOUBLE OCTAVE BEAT.................................................... 24
-TO ALTERTHE FAC CALCULATION...............................................................24
- TO ALTER THE STRETCH DURING THETUNING ........................................ 25
NON-EQUAL TEMPERAMENTS........................................................................ 26
STORING A TEMPERAMENT..................................................................................26
USING A NON-EQUAL TEMPERAMENT PAGE................................................28
CALCULATING AN FAC TUNING WITH A TEMPERAMENT.......................28
SEQUENCING...................................................................................................... 29
STORING THE SEQUENCE.....................................................................................29
USING THE SEQUENCE PAGE...............................................................................30
STORING AN AURALTUNING IN MEMORY.................................................. 30
STORING A TUNING IN MEMORY FROM A PRINTOUT............................. 31
UP OR DOWN MEMORY STORAGE..................................................................32
MEMORY STORAGE WITH THE FOOT SWITCH ..........................................32
UP OR DOWN NOTE SWITCH.......................................................................... 32

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TUNING WITHOUT FAC.................................................................................... 32
DIRECTTUNING THE HIGH TREBLE..................................................................32
DIRECTTUNING THE BASS ...................................................................................33
PATENT NOTICE................................................................................................ 33
INPUT-OUTPUT JACKS ..................................................................................... 33
BATTERY CARE................................................................................................... 34
NICKEL-METAL HYDRIDE......................................................................................34
BATTERY CHARGING CIRCUIT..........................................................................34
TWO YEARWARRANTY..................................................................................... 34
PTG EXAMINATION PROGRAM....................................................................... 34
APPENDIXA......................................................................................................... 37
CONCISE STEP-BY-STEP TABLES OF STANDARD ROUTINES ......................................37
APPENDIX B......................................................................................................... 38
CENTS TABLES FOR NON-EQUAL TEMPERAMENTS.....................................................38
CENTS OFFSET FOR HZ AT A4.......................................................................................39
APPENDIX C......................................................................................................... 39
AURAL AND VISUAL TUNING........................................................................................39
APPENDIX D......................................................................................................... 40
WHAT ARE PARTIALS AND BEATS?..............................................................................40
APPENDIXE......................................................................................................... 41
THE TWO-OCTAVE "A" TEMPERAMENT...................................................................41
APPENDIXF......................................................................................................... 43
CONTIGUOUS-INTERVAL TUNING TESTS FOR ELECTRONIC PIANO TUNERS...........43
APPENDIX G......................................................................................................... 44
OCTAVE TUNING............................................................................................................44
SANDERSON ACCU-TUNER
♦
IV SPECIFICATIONS..................................... 45
INPUT/OUTPUT JACKS ...........................................................................................46
ACCESSORIES...........................................................................................................46

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SANDERSON ACCU-TUNER♦ IV
INSTRUCTION MANUAL
INTRODUCTION
The Sanderson Accu-Tuner IV (Accu-Tuner 4) is the latest in a line of tuning instruments that
continue to be the world's finest programmable computer-controlled tuning instruments. Accu-
Tuners are designed to aid the professional tuner-technician to achieve outstanding tuning
results while spending less time doing so. Aural piano tuners can now "memorize" their finest
tunings. The Sanderson Accu-Tuner stores the note and cents deviation as a tuning program in
its memory and recreates the settings on subsequent tunings automatically. This saves a
substantial amount of time without sacrificing accuracy. The built-in FAC Stretch Calculator
feature automatically programs the Accu-Tuner to create a complete 88-note custom-stretched
tuning.
All operations of the Accu-Tuner are controlled from the sealed membrane keyboard that
instructs the computer which functions to perform. Push the CENTS up button to raise the pitch;
press the CENTS down button to lower the pitch. Similarly, to go up a semitone, press NOTE up,
or to go down an octave, press OCTAVE down. The present pitch settings are always indicated
on the display as note octave and cents.
The pitch difference between the Accu-Tuner and the note being tuned is displayed by the circle
of LEDs (light emitting diodes) on the upper panel. Notes that are in tune with the pitch setting
create a stationary pattern. Two to five LEDs may be on, the important factor is that the pattern is
stationary. Notes that are sharp create an LED pattern that rotates clockwise, and flat notes
create a pattern that rotates counter-clockwise. The center LED flashes when the note is sharp,
and is not lit when the note is flat--this is very helpful when the pattern is rotating very quickly, to
indicate the direction of rotation.
Tuning with the Accu-Tuner can be thought of as a simple two-step process:
1)
Determining the correct settings for each note of a given instrument.
2)
Tuning each note of the instrument to stop the rotation of the LEDs.
Once the Accu-Tuner is mastered the investment will be well worth it in time and labor saved on
each job along with increased pleasure in the tuning profession. The Accu-Tuner will help take
the drudgery out of tuning yet leave the artistry intact. This is the first and only tuning instrument
designed and manufactured by a professional tuner for professional tuners.
Just a quick note to let people who are familiar with Accu-Tuners know that most of the features
of the Accu-Tuner IV work just like the earlier versions except for memory page selection, which
has been simplified. Pages of memory now have their own PAGE button in the previously empty
location between OCT and CENTS buttons. It is no longer necessary to hold down the SHIFT
button to access pages of memory.
The Accu-Tuner IV has a time-out circuit that turns the unit off after one-half hour if none of the
keys on the keyboard have been pressed. If the Auto-Stepping feature is being used to step
through the tuning and zero buttons are pressed for half an hour, the Accu-Tuner will turn itself
off. If the Accu-Tuner times out, it is a Warm Stop, and when the ON/OFF button is pressed the
Accu-Tuner will return to exactly where it left off. If Auto-Off is annoying you, pressing the SHIFT
or NOTE up button resets the thirty-minute timer.
GETTING STARTED
The Sanderson Accu-Tuner starts in the self-calibrating state or at the exact location where the
unit previously "timed out". The Accu-Tuner checks itself for accuracy during self-calibration.
Two to five LEDs may be lit and any rotation shows the variation from A-440. If the LEDs are
rotating please read the section below on calibration. The Accu-Tuner will also automatically

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shut itself off or "time out" to conserve battery power if not used for thirty minutes. The same
settings it had when it turned itself off will appear when the unit is restarted.
The Accu-Tuner will be fully charged when received. The nickel-metal hydride (NiMH) battery will
function for forty to sixty hours before charging is required. This battery is tolerant of deep
discharge, and the Accu-Tuner will turn itself off at a safe low-battery voltage.
BATTERY STATUS INDICATOR
The Accu-Tuner IV has the ability to display the percent of charge left in the batteries. Depending
upon how much the Accu-Tuner has been used since the last charge the display will show in one
percent increments from 100 down to 0 percent. When the indicator gets to zero the Accu-Tuner
turns itself off.
To check the amount of battery charge left in the Accu-Tuner IV:
1)
Hold down the SHIFT 2 button.
2)
Press the BAT (CENTS down) button.
The nickel-metal hydride (NiMH) battery installed in the Accu-Tuner IV is capable of running the
Accu-Tuner for forty to sixty hours (without the backlighting). If the battery charge indicator does
not seem to be working, be patient, the battery is probably lasting longer than expected. The
battery will discharge in ten to fifteen hours if the back lighting is used all the time.
CALIBRATION
The 440 Hz crystal oscillator verifies calibration on the LED display when the Accu-Tuner is
turned on in the CAL mode. If the display is stationary, the instrument is in perfect calibration. If
the pattern is rotating, use the cents buttons to slow the pattern down until the display stops
rotating. Then go into the TUNE mode by pressing the TUNE button. Pressing the TUNE button
will store the new calibration into memory. Now the display will respond to external tones rather
than the internal CAL signal.
THE THREE MODES OF OPERATION
The Sanderson Accu-Tuner has three basic modes of operation:
1)
The TUNE mode.
2)
The FAC (stretch mode).
3)
The MEMORY mode.
Pressing the appropriate button or sequence of buttons on the keyboard, which is shown in figure
1, enters each mode.
Fig. 1. Keyboard of the Accu-Tuner IV.
NOTE: For the moment, disregard the SHIFT AND SHIFT 2 functions. Each will be explained
later according to a specific application.

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1)
The TUNE mode works like most of the conventional tuning instruments. Only six of the eight
white buttons in the center of the keyboard are used, and they control the note, octave, and
cents deviation to which the Accu-Tuner is set. The TUNE mode is the best place to start
when first learning to use the keyboard.
2)
The FAC mode uses three measurements known as stretch numbers to derive a tuning based
upon computer calculations and stretch tables. The FAC tuning is a complete 88 note stretch
tuning from A0 to C8. The three stretch numbers are quick and easy to measure; they are
based on the inharmonicity of the notes F3, A4, and C6. Creating an FAC tuning will take a
few minutes, but the Accu-Tuner will be able to retrieve that tuning at any point in the future.
Tuning two or more pianos for a concert with the tuning in MEMORY is as easy as tuning
them separately and individually. No longer is it necessary to have the pianos side-by-side,
or even in the same room during tuning.
3)
The MEMORY mode enables a tuner to store and retrieve complete 88-note tunings. The
Accu-Tuner IV comes with 401empty pages of memory. This feature is ideal for pianos that
are tuned often. Retuning a piano that is in memory consists of simply restoring each note to
the pitch where the piano was previously tuned.
THE TUNE MODE
Immediately after pressing the TUNE button to exit from the CALIBRATION mode, the displays
will appear as shown in Fig. 2.
Fig. 2. Accu-Tuner display after pressing TUNE.
The NOTE/OCTAVE display shows A4 indicating that the Accu-Tuner is set to A in the 4th octave.
(Start counting the first A on the keyboard as A0, not A1, and the first C is C1.) The cents display
shows 0.0 to indicate that the cents deviation is zero. So the Accu-Tuner is ready to tune the note
A in the 4th octave at 440.00 Hz.
When ready to change the pitch settings from A4, zero cents, use the note buttons in the center of
the keyboard. To go up in the note setting, press the NOTE up button (top row). Watch the
display until it steps to the desired note, and then release the button.
To step the NOTE display down, press the NOTE down button until the desired note. The OCT up
and OCT down buttons work the same as the NOTE up and NOTE down buttons, stepping off the
octaves to get to the desired setting. The Accu-Tuner will not step beyond its mode ranges,
which are as follows:
1) C1 to B9 in the TUNE mode.
2)
A0 to C8 in the FAC tuning or page of memory. (C3 to F6 in old stretch mode)
The CENTS buttons step differently from the other white buttons. The CENTS buttons step up or
down slowly at first, and accelerates as the button is held down.
To cover a large number of cents quickly, hold down the CENTS button and watch the display as
the cents change. When the correct tens digit appears, release the CENTS button. Then hold the

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button down again until the correct single digit appears and release. Repeat this procedure for
the tenths digit.
With these six white buttons, the Accu-Tuner does everything that previous tuning instruments
have been able to do. Once familiar with operation in the TUNE mode, explore the other modes
of operation. If you get into an area of operation that you don't understand, just press the TUNE
button and the Accu-Tuner will revert back to the TUNE mode.
THE MEMORY MODE
The Accu-Tuner is not restricted to storing or tuning only on the fundamental pitch or one specific
partial of each note. The choice is left to the tuner. This flexibility is necessary to tune all types
and kinds of pianos, which vary widely in the strength, and audibility of their various partials.
The complete list of storable pitches relative to a given played note is as follows:
1)
Fourth below
2)
Semitone below
3)
Fundamental, or first partial, i.e., the note itself
4)
Octave above less one semitone
5)
Octave above, or second partial
6)
Octave fifth, or third partial
7)
Double-octave less one semitone
8)
Double-octave, or fourth partial
9)
Seventeenth, or octave tenth, or fifth partial
10)
Nineteenth, or double-octave fifth, or sixth partial
11)
Double-octave Minor seventh, or seventh partial
12)
Triple-octave, or eighth partial
13)
Triple-octave second, or ninth partial
14)
Triple-octave major third, or tenth partial
15)
Triple-octave fifth, or twelfth partial
16)
Triple-octave Minor seventh, or fourteenth partial
This list includes all partials from one to ten, plus the twelfth and fourteenth; one semitone low
for the first, second and fourth partials; and one subharmonic, the fourth below. This set is
complete with all the notes necessary for tuning pianos at pitch or below pitch, as well as pipe
organs with mixture stops. Early musical instruments can be stored one semitone low (A=415 Hz
by two methods:
1)
Exactly with an offset of -101.3 cents.
2)
Approximately with notes stored one semitone low (on the first, second, or fourth partials.)
Tuning is far more accurate when set to listen to higher partials, specifically partials that
correspond to those used by aural tuners. These vary from bass to treble with the highest
partials preferable in low bass, and the fundamental in the treble.
The tuning of a particular piano can be stored either from a written record of a tuning or from the
piano itself during the tuning or immediately after completing a tuning. The Accu-Tuner will be
ready to repeat the correct settings from memory whenever it is time to tune that piano again.
Just go to the correct page (press PAGE to select the correct page and piano) and start to tune.
Going from one note to the next is as easy as pressing the NOTE up button, automatic note
stepping or the foot switch.
Range of Memory Mode
The range of notes covered in the MEM mode is different from the other TUNE mode. Each page
of memory covers the 88 notes of a standard piano, known to the Accu-Tuner as A0 through C8.
Notice that although the three notes in octave zero can be stored in memory, they must be tuned
to a partial other than the fundamental since the lowest note in TUNE mode is C1.
NOTE: Tuning the bass notes on higher partials will deliver more accurate results.

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Tuni ng from Memory
The header list shows the tunings that are stored on the pages of memory. To set the Accu-Tuner
up to reproduce a tuning, turn on the Accu-Tuner and press the TUNE button, use the PAGE
buttons to step to the page number assigned to this piano. (It is not necessary to press MEM
because selecting a page automatically puts the Accu-Tuner into the MEMORY mode). To start
with a note other than A 0, step up to the desired note and begin tuning.
When ready to tune the next note, just press NOTE up or down, and tune away. The notes can
be tuned in any sequence (when using a sequence page the Accu-Tuner will follow a
programmed tuning sequence), up, down, or by octaves, and the stored values for the selected
note will appear. The fastest way to tune is with the automatic stepping, since both hands are
free for tuning.
The display in MEM mode shows the note being tuned, and the cents deviation of the partial. To
check the page number, press the MEM button. To check the partial, press the TUNE button and
read the partial in the NOTE OCTAVE location. Always remember to press the MEM button after
checking the partial or the Accu-Tuner will be left in the TUNE mode, not following the memory
tuning.
Pag e N u mber D i s p lay
To see how this works (turn on the Accu-Tuner, press the TUNE button) press PAGE up once. A
numeral 1 will appear momentarily in the CENTS location, to indicate that storing or retrieving a
piano can now be done on or from PAGE 1. To change the PAGE, press PAGE up or down. When
the page number is displayed there isn’t a decimal point.
The pages of memory in the Accu-Tuner IV is set up as follows:
Just above page 122 of memory: Overpull, Sequence 1, 2, 3, 4, 5, 6, 7, Sequence 8,
Temperament 1-7, Temp 8 – 14, Temp 15-21, Temp 22-28, Sup 1, Sup2, Sup 3, Sup4, Examinee,
Generic Tunings are located on pages 141 through 309.
Blank Pages of memory Pages 1 to 122
Pitch Raising Custom Overpull
Page
Page 123
Sequence pages 1 - 8 Pages 124 to 131
Temperament page, for temp 1- 7 Page 132
Temperament page, for temp 8- 14 Page 133
Temperament page, for temp 15 -
21
Page 134
Temperament page, for temp 22-28 Page 135
PTG Exam - Supertuning 1 Page 136
PTG Exam - Supertuning 2 Page 137
PTG Exam - Supertuning 3 Page 138
PTG Exam - Supertuning 4 Page 139
PTG Exam – Examinee Tuning Page 140
Generic Tunings Page 141-309
Blank Pages of memory Page 310-589
Stepping down, the page numbers will stop at PAGE 0. PAGE 0 will not store a piano; it is
designed into the Accu-Tuner to make it difficult to mistakenly write a new tuning on top of a

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valuable tuning. When the Accu-Tuner is turned on, the PAGE number is automatically set to
zero. A page of memory has to be selected before storing a tuning to memory.
To select a page of memory, turn on the Accu-Tuner, press the TUNE button, press the PAGE up
button to step up through the pages of memory. The pages will stop at page “EXAMINEE”,
release the PAGE up button, press PAGE up button again to enterh the generic tunings on pages
141 to 309.
To access the pages of memory from 310 to 589 you will need to turn on the Accu-Tuner, press
the TUNE button and then hold down the SHIFT button and then hold down the SHIFT 2 button
which will switch the page of memory to 310. Any time you hold down the SHIFT and SHIFT 2
buttons the page number will step up to page 310.
FAC TUNINGS
Once the operation of the Accu-Tuner in the TUNE mode is understood, it is easier to work with
the FAC program to create an 88 note tuning. In this mode, the Accu-Tuner creates a tuning that
is derived from the measurement of three stretch numbers on notes (F3, A4, and C6) on the piano
being tuned. The FAC program includes both an optimum partial selection and a calculated cents
setting for all 88 notes on the piano. Once the stretch numbers are measured and stored in the
Accu-Tuner, the rest of the tuning is automatic. Every time the note or octave changes, the
computer references the FAC tuning on the page of memory and sets the Accu-Tuner up correctly
for each note.
With an FAC tuning the upper left side of the display shows the note on the piano that is being
tuned, while the right hand side in the upper half of the display shows the cents deviation of the
particular partial being tuned. The partial that the Accu-Tuner is listening to (first, second, fourth,
or sixth) does not show on the display. To view the partial the Accu-Tuner is listening to, switch to
the TUNE mode, by pressing the TUNE button. Don't forget to switch back to the page in memory
by pressing the MEM button before going on to the next note. If the MEM button is not pressed,
the Accu-Tuner will continue in the TUNE mode, and not follow the FAC tuning.
The pitch of an FAC tuning is normally created at 440Hz pitch. A pitch correction can be added or
subtracted up to 150 cents flat or sharp. This is very helpful if you would like to float the pitch of
the piano. If a piano is 140 cents flat, it is easy to create a tuning seventy cents flat and smoothly
bring the piano halfway up to pitch today.
The FAC tunings fit the piano better than previous stretch tunings and sound better over the mid-
range section as well as providing a beautiful bass and treble tuning. The high treble is tuned in
double octaves, which will please many tuners, and those who prefer single octaves can easily
modify the last few notes of the treble to suit your own taste. The standard FAC tuning can be
altered to suit personal preference, be sure to read the section covering adjusting the double
octave beat, see page 24.
MEASURING AND STORING THE FAC NUMBERS
BASIC METHOD
1)
Set the Accu-Tuner to F5, zero cents in the TUNE mode. Play one string of F3 and use the
tuning hammer to stop the rotation of the LEDs.
2)
Press OCTAVE up to step up one octave on the Accu-Tuner to F6, and play F3 again, and use
the CENTS buttons to stop the rotation of the LEDs. The cents deviation now displays the F3
stretch number, which is the difference in cents between the fourth and eighth partials of F3.
3)
Hold the SHIFT button, press STO-STRETCH, release STO-STRETCH, release the SHIFT button
last. If successful, the Accu-Tuner will jump to A5 and zero cents.
4)
With the Accu-Tuner at A5 and zero cents, play one string of A4 and use the tuning hammer to
stop the rotation of the LEDs. Now press OCTAVE up to step up one octave on the Accu-Tuner
to A6. Play A4 again, and use the CENTS button to stop the rotation of the LEDs. The cents

11
deviation now reads the A4 stretch number, the difference in cents between the second and
fourth partials of A4.
5)
Store the A4 stretch number by holding the SHIFT button, press STO-STRETCH, release STO-
STRETCH, and release the SHIFT button last. The Accu-Tuner will automatically go to the
correct settings for the next measurement, C6 and zero cents.
6)
With the Accu-Tuner at C6 and zero cents, play one string of C6 and use the tuning hammer to
stop the rotation of the LEDs. Now go up one octave on the Accu-Tuner to C7, and stop the
rotation of the LEDs using the CENTS buttons. The cents deviation now reads the C6 stretch
number, the cents difference between the first and second partials of C6. Store the C6 stretch
number by holding the SHIFT button, press STO-STRETCH, release STO-STRETCH, release
the SHIFT button last. Now that all three FAC stretch numbers are entered, the Accu-Tuner is
ready to calculate the FAC tuning to a page in piano memory. The FAC tuning cannot be
used until it is created on a page of memory; if this piano is not a regular customer, then use
page one for all the occasional tunings.
7)
Use the PAGE buttons to select the page in piano memory that will hold this tuning.
8)
To create the FAC tuning and store it in a page of memory; hold down the STRETCH button,
next hold down the MEM button, release the STRETCH button, release the MEM button last.
The order of holding down and releasing the buttons is critical. We refer to this procedure as
rolling over from STRETCH to MEM. If correctly done, the Accu-Tuner will display “FAC”
while the STRETCH and MEM buttons are held down. When the STRETCH button is released
the display will show “BUSY” for one to two seconds as the FAC tuning is calculated and
stored on the selected page. At the end of calculating the tuning the Accu-Tuner will display
A0 and the cents deviation for A0.
You are all set to start tuning the note A0. To start at any other note, just proceed to that note
with the NOTE and OCTAVE buttons.
A VE R A G I N G S T R ET C H N U M B ER S F O R H I G HE R A C C U R A C Y
The above procedure applies to measuring only one open string on each note. For increased
accuracy, take measurements on each string of a note individually and average the results.
Another way to average out the measurements is to measure one string on two adjacent notes.
Measure the inharmonicity of E3, F3 and F#3 and average for the F3 stretch number. The same
method of measuring the note above and the note below can be used for A4 and C6 as well. If
one of the strings disagrees badly (more than a couple cents) with the others, throw out this
reading before averaging.
Some Accu-Tuner owners have expressed a preference for starting with the A-4 measurement vs.
the sequence described above. As long as the correct partials are selected on the Accu-Tuner,
the FAC measurements can begin with any of the three F-A-C notes.
IF N O TH I N G H AP PE N S
Suppose you try to store a stretch number and nothing happens? This can be disconcerting but
the problem is usually very simple to solve. The FAC program is particular about being on the
correct note when storing a stretch number. You must have the Accu-Tuner on F6 in the TUNE
mode (by pressing the TUNE button) to store the F3 stretch number, and if not, nothing at all will
happen. To store the A4 stretch number the Accu-Tuner must be on A6, and to store the C6
stretch number Accu-Tuner must be on C7. The Accu-Tuner has to be on the correct note to store
a stretch number.
Another situation that can raise a problem is when the Accu-Tuner is set to page zero when trying
to calculate an FAC tuning. Simply select a valid page in memory (use the PAGE buttons) and
repeat the STRETCH rollover to MEM procedure.
FAC TUNING PARTIALS

12
When the Accu-Tuner creates an FAC tuning the program creates the tuning and sets the partial
in the following manner. In the bass the Accu-Tuner is listening to the sixth partial, in the
midrange the Accu-Tuner is listening to the fourth partial, treble the second partial and the upper
treble the first partial or the fundamental. The FAC partials can be conveyed as similar to a
phone number 664 4211. This is illustrated in more detail in the following table:
OCTAVE PARTIAL KEYBOARD PITCH OF PARTIAL
Octave 0 Sixth Partial A0 E3
Octave 1 Sixth Partial A1 E4
Octave 2 Sixth Partial A2 E5
Octave 3 Fourth Partial A3 A5
Octave 4 Fourth Partial A4 A6
Octave 5 Second Partial A5 A6
Octave 6 First Partial A6 A6
Octave 7 First Partial A7 A7
Octave 8 First Partial C8 C8
You probably noticed that as you tune from the bass up the scale of the piano that the cents
deviation will jump. You may tune the note B 2 on the piano with a cents deviation of plus 1.6,
then step up one note and C3 will have a cents deviation of minus 2.5. The reason for the
decrease in the cents deviation is on the note B 2 the Accu-Tuner is listening to the sixth partial
and when we step up to C 3 the partial changed to the fourth partial and the cents deviation is
lowered to compensate for the partial change.
A QUICK METHOD FOR STORING STRETCH NUMBERS
Another feature of the Accu-Tuner IV is the ability to adjust and store the FAC numbers without
having to follow the entire sequence outlined above. This is helpful in many situations: if the
stretch numbers are already known, it is possible to enter the stretch numbers quickly.
The following procedure assumes the Accu-Tuner is off; it is not necessary to follow every step if
the unit is already in use.
1)
Turn on the Accu-Tuner
2)
Press the TUNE button
3)
Hold down the STRETCH button.
4)
The display will show F3, A4, or C6. The cents will show the current value of the
corresponding stretch number. While holding the STRETCH button use the CENTS up/down to
adjust the stretch number to the desired value.
5)
After the stretch number is adjusted to the correct value, release the STRETCH button
6)
Hold down the STRETCH button a second (or third) time.
7)
Adjust the next stretch number by using the CENTS up/down to adjust the value.
8)
Release the STRETCH button.
9)
Repeat steps 6-8 until all the stretch numbers are entered correctly.
10) With the new stretch numbers properly stored. Select a page in memory, roll over from the
STRETCH to MEM button, which will calculate the FAC tuning and store it to memory.
REVIEWING THE FAC NUMBERS
To review the FAC numbers for a tuning just created or about to be created, use the following
procedure. Hold down the STRETCH button, while held down one of the three stretch numbers
will be displayed. The display will show F3 and show the F3 stretch number. Release the
STRETCH button and hold it down a second time to see the A4 stretch number. Release and hold

13
the STRETCH button again for the C6 stretch number. The stretch numbers will continue to cycle
through F3, A4, and C6 to review them again.
NOTE: Some tuners have reported that the FAC numbers tend to get better, that is, drift lower as
a piano is tuned repeatedly.
The FAC numbers are automatically inserted into the header that is part of the tuning record of
each piano. The header below is an example, which shows page 1, has the FAC numbers of 10.2
for F3, 8.8 for A4, and 7.9 for C6:
001_______________________________________________________10.2 8.8 7.9 FAC
V iew i ng FA C N umbers from a Page in Memory
To view or copy the three stretch numbers from an existing FAC tuning in memory, use the
following procedure:
1)
Turn on the Accu-Tuner.
2)
Press the TUNE button.
3)
Use the PAGE buttons to get to the desired page in memory to view/copy the stretch
numbers.
4)
Hold down the SHIFT 2 button.
5)
Press the STRETCH button.
6)
The three (F3, A4, or C6) stretch numbers will be loaded into the FAC stretch number
memory.
7)
Release the SHIFT 2 button.
8)
Hold down the STRETCH button (to view the first stretch number).
9)
Release and press down the STRETCH button a second time (to view the second stretch
number).
10) Release and press down the STRETCH button a third time (to view the third stretch number).
Co py and Pa ste an E nt i re Pa ge of Memory
Go to the page of memory that you would like to make an exact copy of, lets say page 17, once
on page 17 hold down the GREEN SHIFT and press the COPY button (MEM in black). The display
will show COPY THIS PAGE, use the PAGE button to go to the desired page for making a copy,
then hold down the GREEN SHIFT and press the PASTE button (TUNE in black). The display will
show PUT COPY HERE; at this point the Accu-Tuner IV has made an exact copy of the selected
tuning to the paste page.
Off setti ng a n FAC Tu n i n g to No n- S tan dar d Pitc h
Tuning and pitch-raising a piano to non-standard pitch is very easy with the FAC program.
Prepare the Accu-Tuner with the RESET feature to get the Accu-Tuner offset to the required pitch.
For instance, to tune at 442 put 7.9 cents into the CENTS location, hold down SHIFT and press
RST. (Add approximately four cents for every Hz above 440 Hz, or subtract for every Hz below
440 Hz for the tuning, table and formula below.) The cents display is reset to zero, and the 7.9
cents is stored as a pitch offset. The plus sign will appear just to the left of the note and octave,
which indicates the pitch is offset on the sharp side. Any pitch offset up to a semitone sharp or
flat can be store this way.

14
After the pitch offset is stored, take the FAC measurements as usual, when the tuning is stored to
a page in memory, the cents offset will be added or subtracted from all eighty-eight notes as they
are stored to the page of memory.
As an example let’s say we have a piano that we want to leave twenty cents flat, store an offset
of -20.0 cents (hold SHIFT and press RST), then measure the F3, A4, C6 stretch numbers with the
standard method. When the Accu-Tuner calculates the FAC tuning it will subtract twenty cents
from all 88 notes as it stores the tuning on a page in memory. Assume the Accu-Tuner would
normally store A0 as -18.2 cents it would now store the note A0 -18.2 - 20.0 (cents offset) and
store the note A0 as -38.2.
Cents O ff set f or Hz at A4
Freq uency of A4
Cents O ff set
Freq uency of A4
Cents O ff set
446 23.5 438 -7.9
445 19.6 437 -11.8
444 15.7 436 -15.8
443 11.8 435 -19.8
442 7.9 430 -39.8
441 3.9 420 -80.5
440 0.0 415.3 -100.0
439 -3.9 415 -101.3
Formula for calculating cents offset of A4 at 420Hz: Log (420/440,2)*1200 = -80.54
" Go o d" F AC N u mber s
You can tell a lot about a piano and its scale design from the FAC stretch numbers. The three
numbers should be reasonably close to each other and lie in a reasonably straight line. For
example, FAC numbers such as 10, 8, 6 or 5, 6, 7, or 8, 8, 8 represent well-scaled pianos. Don’t
be alarmed if stretch numbers measure 25 for F3, 6 for A4, and 8 for C6, those three stretch
numbers exist on a spinet piano. The mention of “good” stretch numbers is just for general
information; in practice there can be a large diversity between stretch numbers. The lower the
numbers, the lower the inharmonicity, so spinets tend to measure higher stretch numbers than
grand pianos.
The FAC method, or any other method, cannot produce perfectly progressing beat rates on a
piano with poor scale design. Some of the less expensive spinets have measured FAC numbers
of 25, 6, and 8. It is essentially impossible to create smoothly progressing beat rates across such
diverse levels of inharmonicity. However, the FAC tuning will be as good as one can expect or
can achieve by any method given the scale-design problems inherent in the piano itself.
One method for helping with pianos that have poor bass-tenor breaks is to use the Double Octave
Beat feature to work out the scale design problems smoothly. See page 24.
FAC Tuni ng from A0 t o C8
After the FAC tuning has been calculated to a page in memory, tuning can start on any note.
When ready to tune the next note, press NOTE up (if the automatic note stepping is not turned on)
or step on the foot switch. For every semitone the Accu-Tuner will automatically update the
partial and cents deviation for the next note, continue stepping and tuning this way for the entire
88 notes.
When tuning A4 the Accu-Tuner WILL NOT BE SHOWING 0.0 cents, this is normal. Behind the
scenes the Accu-Tuner is tuning listening to the pitch of A6, and the cents deviation is
compensated to tune A4 at 440 Hz. To double check A4 is perfectly at 440 Hz, see page 22.
U n is o n T u ni n g
Unisons may be tuned aurally along with a stretch tuning of the center string, or each string may
be tuned individually to the Accu-Tuner and the unisons checked aurally later on. The Accu-
Tuner will do an excellent job of tuning unisons when the strings of a given note are well
matched. (They are on most notes.) The fact that some strings are mismatched makes it

15
extremely important for the tuner to check all unisons aurally when they have been tuned with
the Accu-Tuner. However, do not try to check the unisons aurally during any pitch raise. Pulling
up adjacent strings affects the pitch of the strings that have already tuned. The settling process
on a string is not complete until another octave or so has been tuned.
Aural unison tuners should be aware that pulling in two outside strings to the tuned center string
will affect the pitch of the center string. The amount is roughly equal to one-fifth of the net pitch
change. As a result, when there is more than a few cents pitch change involved, tuning unisons
aurally can actually leave them out of tune in the end! To avoid getting into this situation, give
the piano a quick pitch raising (or lowering) before trying to do a fine-tuning. If the piano is more
than five to ten cents flat, it will actually save time to do a quick pitch raise before attempting to
fine-tune the piano.
ONE STRETCH NUMBER MEASUREMENT FOR TUNING
By Jame s W. Coleman, Sr.
1.
Turn on SAT, press TUNE button to get out of Calibrate mode if LED's are stopped.
2.
Tune A4 and carefully to stop display with 4 LEDs.
3.
Press OCT/UP twice to get to A6
4.
Hold down MSR button momentarily to stop display, trim up with CENTS buttons.
5.
Multiply this cents value by .8 to get the Stretch number which works with FAC. This gives the
same value as with measuring the difference between the 2nd and 4th partials of A4, but
insures that the A4 fundamental will always be on target. (Or set the Accu-Tuner to multiply
automatically, see instructions below).
6.
Store this value by holding down blue SHIFT and pressing STO-Stretch.
7.
Press PAGE/Up button once to select page 1.
8.
Accept the default stretch values of F3=8 and C6=6, hold down STRETCH, hold down MEM,
release Stretch, release MEM. When A0 value appears, the scaling is complete.
9.
Change OCT to 4 to confirm that the fundamental and 4th partials are still correct.
10.
Change to A3, Play A4 to see the 4-2 octave relationship even before A3 is tuned. If dots are
stationary, use .5 DOB to get .5 bps between the 4th partial of A3 and the 2nd partial of A4
(this will give a .5 bps difference between F3-A3 and F3-A4). To invoke DOB, hold down blue
SHIFT and touch CENTS/Up once for each .1 bps. If the dots are moving slightly counter-
clockwise while playing A4, see how many .1 cents you need to add to make the display stop.
This shows how many .1 cents narrow the 4-2 octave relationship already was. If it required
.4 cents to stop the display, this means that 1.0 cents more (total of 1.4 cents) would be
needed to bring the beat difference up to plus .5 HZ between the 2nd partial of A4 and the 4th
partial of A3. This means that 1.4 cents adjustment needs to be made since at the pitch of A5
(the coincidence of the 2nd and 4th partials) 1.0 cents equals .5 Hz. Adding .2 DOB would
stretch the A3 downward so that there would now be a .0 HZ difference between the 4th
partial of A3 and the 2nd partial of A4. Then adding another .5 DOB would stretch the A3
downward another 1/2 beat to make the M3rd-M10 test (aural test for 4-2 type octave) show a
stretch of 1/2 beat per second.
Any time a DOB change is made, press note up and down for the change to take effect.
Another way of thinking about these changes is to find out how many .1 cent changes are
needed to make the LEDs rotate clockwise two lights per second while playing A4 with the
program set to A3 (it listens at A5). Take one half of that needed amount and add that much in
DOB control. If 0.8 cents are needed to rotate the LEDs clockwise two per second, then you
need .4 DOB to stretch the A3-A4 octave that much. Thus, the 4-2 type octave aural test (F3-
A3) (F3-A4) will make the M10th to be 1/2 bps faster than the M3rd. This will also stretch the
double and triple octaves in both directions, Treble and Bass. If this becomes too much in the
Bass, one can decrease the DOB as needed, or one can add more DOB if the Bass needs
more stretching.
11.
Tune the A3 to this setting.
12.
Play A3 and A4 to check the sound of the octave. Some low inharmonicity pianos cannot take
as much 4-2octave stretch as others and still sound good.
13.
Set auto note stepping by holding down the blue SHIFT button and pressing the NOTE/Up
button once, then the NOTE/Dn button once.
14.
Commence tuning downward from A4 to the lowest plain wire note. Utilize parallel aural tests
along the way as a quality control method for the machine tuning.

16
15.
Every two or three notes below A3 aurally check the sound of the octave to make sure you do
not have too much stretch in the sound of the octave. The minor 3rd-M6th test is good to use
(if the min 3rd is slower than the M6th, the octave is stretched beyond the 6-3 relationship). If
the octave is becoming too wide, you can decrease the DOB .1 bps at a time about every 3 or
4 notes if desired.
16.
Continue tuning upward from A4, tuning unisons as you go. Place 3/4" rubber wedge between
L and Center strings and TUNE R string. Move wedge between C and R strings and TUNE L
string. Move wedge to between the L and C of next note and TUNE the center string by ear to
the previously tuned L and R strings. To insure stability, play each string at least 4 or 5 times
firmly at the stopped display position. Then when all three strings are sounding together, you
can get an idea how solid the unison is. Any tendency for the three strings to be at a lower
pitch than the single strings can be corrected with the tuning of the middle string aurally.
17.
As soon as I get to F5, I can check the relationship of the double octaves below and see that
there is a slight spread of the double octave and that the octave-5th is almost pure. By the
time I get to C6, I can see the relationship of the double octave, the single octave-5th, the
double octave-5th, and I can listen to the parallel 17ths progression. At F6 I can play the note
F3 to see how the triple octaves are matching up. If I notice the triple octave test shows the
dots moving counterclockwise, I can reign in the DOB a little bit, .1 beat at a time, every two
or three notes.
18.
From C7 to C8 each individual string is tuned with the SAT. The finished unisons can be
listened to for clarity sake and correction if necessary. In this area, unisons are usually better
tuned with the SAT than tuned strictly aurally. In this area, I can do all the tests mentioned in
18 above. If the triple octave is fairly close to my setting, the single octave-5th will usually be
a little wide while the double octave-5th will be dead-on or slightly narrow. In this case, the
quadruple octave will usually be a little narrow. I can tell all of this just by watching the drift
of the LEDs as I play the various test notes below.
19.
TUNE the unisons aurally from the lowest plain wire notes through A4. Let the SAT follow
you so that you can detect any correction, which may be necessary after the firm playing of
the unisons. Play repeatedly about 1 to 2 blows per second. Listen to the interplay of the
highest partials you can hear and bracket in the unisons as closely as possible. On pianos,
which I know to have little or no single string beating, I may elect to tune all 3 strings with the
SAT.
20.
Bass tuning on 7' or 9' pianos works very well with the regular measured FAC tunings.
However, for medium or small pianos I like to stick to the pure 6-3 type octaves where the
minor 3rd test equals the M6th test as complementary intervals of the octave. To achieve
this, I use negative DOB like this: For example if I am tuning B2 to B3, I play B3 (already
tuned) while the SAT is on B2. B3's 3rd partial (F#5) will probably be moving clockwise. I
select enough negative DOB to cause the LEDs to stop, then I tune the B2 to this setting
(remember that it is necessary to press note up then note down to get the new DOB applied). I
felt strip out the Bass section while tuning these octaves. After tuning 3 or 4 notes this way, I
will recheck the 6-3 octave match. If when playing the upper note of an octave to be tuned, I
should notice the LEDs drifting sharp again, I will invoke additional negative DOB. When I get
to the lowest few notes of small pianos, I may allow the upper note of the octave to show a
slight drift in the clockwise direction to add a little more stretch (these notes always sound a
little sharp anyway).
21.
I TUNE out the unisons after pulling out the felt strip. I try to make the best compromise
possible in the unisons. I play the notes repeatedly as in the aural unisoning of the midrange,
looking for that most solid sound at impact.
PS This looks and reads much more difficult than doing it. Its advantage is that you begin tuning
immediately and you need to store only 1 measurement in the process. The DOB adjustments
are made "on the fly” and very few are necessary. JWC
USING THE A4 STRETCH NUMBER MULTIPLIER.
There is a method for measuring the A4 stretch number, which is a direct method of tuning A4 to
the fundamental. The newer style described above tunes A4 once instead of tuning A4 for
measuring the stretch number and a second time for the FAC tuning.
Temporary changing of the A4 multiplier:
1)
Turn on Accu-Tuner

17
2)
Before pressing the TUNE button, press the NOTE up or down until the desired multiplier
is shown in the cents display, 0.8 for the Coleman method of measuring the A4 stretch
number. The A4 multiplier can be adjusted from 0.4 to 2.0.
3)
Press the TUNE button and the Accu-Tuner will automatically multiply the stored A4
stretch number by the multiplier, until the Accu-Tuner is turned off with the ON/OFF
button.
If you prefer to always multiply the A4 measurement by a multiplier then use the procedure on
page 19. This will alter the default multiplier from 1.0 to the selected multiplier. Every time the
Accu-Tuner is turned on it will come on with the modified A4 multiplier.
AUTO NOTE STEPPING
Auto Stepping allows the technician to tune the piano without having to press the footswitch or
the NOTE up/down buttons. Both halves of this feature can be toggled on or off independently.
To turn on the Auto Note Stepping up feature:
1)
Turn on the Accu-Tuner, press the TUNE button
2)
Hold down the SHIFT button
3)
Pressing the AUTO up (NOTE UP) button and AUTO STEP UP will appear momentarily in the
lower half of the display.
If you were tuning A4 and had the step-up feature turned on, the Accu-Tuner IV will respond to
the note A4, and also A#4. If the Accu-Tuner IV hears the note A#4, it will automatically step up
to the note A#4. When auto step up is toggled on, two bars (one in the middle and one in the top
half of the display) will appear to the right of the Octave in the note/octave display. The two bars
(like rungs on a ladder) illustrate the Auto-Stepping up is on with a glance at the display.
To turn on the Auto Note Stepping down feature:
1)
Turn on the Accu-Tuner, press the TUNE button
2)
Hold down the SHIFT button
3)
Press the AUTO down (NOTE down) button and the AUTO STEP DOWN will appear
momentarily in the lower half of the display.
The Auto-Stepping Down works similar to the UP feature, when tuning A4 the Accu-Tuner will
also listen for the pitch of G#4. If the note G#4 is played, the Accu-Tuner will automatically step
down to G#4. When auto-stepping down is toggled on two bars (one in the middle and one in the
bottom half of the display) will appear to the right of the Octave in the display.
To turn off the Auto Stepping, you can follow the same procedure listed above will toggle off the
Auto Stepping feature.
If both the AUTO STEP UP and the AUTO STEP DOWN features are activated, the Accu-Tuner will
be listening for three different pitches: the pitch being tuned, a pitch one-hundred cents flat and a
pitch one-hundred cents sharp. And the display will show three bars to the right of the Octave
number display similar to three rungs on a ladder.
Q ui c k N ote o n A ut o S te ppi ng
—in the bass the Accu-Tuner is set to listen to the sixth partial;
on some pianos the partial can be weak on certain notes. If the Accu-Tuner is not stepping
crisply, play the note an octave higher and the Auto Stepping will have a stronger signal to step
up or down with.
BACKLIGHT ON THE DISPLAY
When the Accu-Tuner IV is first turned on the LCD is not backlit. Holding down the GREEN SHIFT
button for two seconds will toggle on or toggle off the backlighting. To adjust the brightness of
the backlighting, turn on the Accu-Tuner IV and BEFORE pressing the TUNE button, hold down the
GREEN SHIFT button to turn on the backlighting, release and hold down the GREEN SHIFT button
a second time, a bar graph will appear and slowly decrease, which indicates lowering the
intensity of the backlight. As the GREEN SHIFT is held down, the back lighting will decrease to
the lowest setting and then back up to full intensity. When the backlighting is adjusted to the
desired intensity, press the TUNE button to work with the Accu-Tuner. The brighter the
backlighting, the less time the battery will run on a charge, full intensity on the display will

18
shorten the battery life by over fifty percent. While using the SAT, holding down the SHIFT 2 for
more than two seconds alone will toggle the back lighting on and off.
There is a method to adjust the brightness of the backlighting and to set the backlighting to come
on every time the Accu-Tuner IV is turned on. Please look in the MENU section, just below.
USING THE HELP FUNCTION
To start using the HELP function, hold down the SHIFT button and press the HELP button. Press
the NOTE up button to select the topic, when the topic you would like assistance with is displayed
press the OCT down button to enter the instructions, press the STRETCH button to have the
instructions scroll by on the display.
OCTave down button will expand the displayed help topic
OCTave up will raise the index up to the next topic
NOTE down will open the next layer of the HELP topics.
NOTE up will raise the index finger towards the next level up on the help index.
BLUE SHIFT will back out of the HELP mode and back to the TUNE or MEM page.
Instructions for using help will start to be displayed in the order below, so when the HELP is first
selected, pressing NOTE down will display
1)
Instructions for using the STRETCH button to scroll help instructions,
2)
Press the NOTE down button displays www.Accu-Tuner.com and 800-327-8440,
3)
Press the NOTE down again displays INTRODUCTION, which is the first topic in the
instructions.
Every successive NOTE down button will progress straight down the major headings of the
manual. If you wanted information on the Auto Note Stepping, you would press the NOTE down
button seven times, when AUTO NOTE STEPPING is displayed press the OCT down button and
the first line of the note stepping directions will be displayed. If you press the STRETCH button
the directions will start scrolling across the display, if you press a PAGE button the directions will
stop scrolling.
MENU FOR NEW FEATURES
When the Accu-Tuner IV is first turned on if you hold down the SHIFT button the SAT will briefly
display the version of the program and then step into the menu of options for the Accu-Tuner.
Each press of the NOTE up button will display a different menu function: swap DOB & CENTS,
NOTE/OCT or EURO, A Multiplier Def, Temperaments, AUTO STEP DELAY, LAMP DEFAULT,
EXIT.
SWAP DOB & CENTS
Some users of the Accu-Tuner III have become very dedicated users of the Double Octave Beat
to the point that the DOB is used more often than the CENTS buttons during a tuning. In response
to the popularity of the DOB function you can swap the DOB and CENTS. After swapping the
CENTS function requires using the SHIFT button and the DOB is accessed without using the
SHIFT button.
1) Turn on Accu-Tuner, hold down the SHIFT button till MENU appears
2)
Press the NOTE up button once, display showing: “swap DOB & CENTS”
3)
Press the SHIFT button, display showing: “CENTS no shift”
4)
To change, press NOTE up till display is showing “DOB no shift”
5)
To store the change, press the SHIFT button
DISPLAYING THE NOTE/OCT OR EUROPEAN

19
When the Accu-Tuner was first manufactured there was a choice in the method of referencing
notes on a piano. Al Sanderson decided to work with the first A on the piano would be A 0, the
first C would be C 1 and work up the keyboard by octaves. Another method to denote the note
you are tuning was to call the first note on the piano A1, second note as A#2, B 3, C4, C#5 all the
way up to C 88. The Accu-Tuner will go all the way up to B 111.
1) Turn on Accu-Tuner, hold down the SHIFT button till MENU appears
2)
Press the NOTE up button twice, display showing: “NOTE/OCT or EURO”
3)
Press the SHIFT button, display showing: “NOTE OCTAVE”
4)
To change, press NOTE up till display is showing “NOTE and Number”
5) To store the change press the SHIFT button
“A “ MULTIPLIER DEFINITION
If you have found that you enjoy using the Jim Coleman method of measuring the A Stretch
number, then it is possible to set the Accu-Tuner IV to multiply the A4 stretch number at eighty
percent as a default. Once the directions below are followed the Accu-Tuner IV will always
multiply the A 4 measurement by eighty percent (until reset to 1.0), so please set this default with
caution.
1) Turn on Accu-Tuner, hold down the SHIFT button till MENU appears
2)
Press the NOTE up button three times, display showing: “A Multiplier Def”
3)
Press the SHIFT button, display showing: “A Multiplier Def” and 1.0 when first selected.
4)
To change, press NOTE down till display is showing “0.8”
5)
To store the change press the SHIFT button
To return the Accu-Tuner to the original method for measuring the A4 stretch number, follow the
above directions except in step 4 press NOTE up button until 1.0 is displayed, then press the
SHIFT button.
TEMPERAMENTS
Previously with the Accu-Tuner III, the PAGE button would used to go above the regular pages of
memory until you reached the temperament page 1-7t, or 8-14t then select the correct octave to
enter the non-equal temperament offsets. With the Accu-Tuner IV there is a more direct method
to enter the temperament-offset numbers.
1) Turn on the Accu-Tuner IV
4)
Hold down the SHIFT button till the display shows MENU
5)
Step up with the NOTE button until the display shows Temperaments
6)
Press the SHIFT button and TEMPT 1 temperament will be in the displayed.
If you would like to change the first temperament offsets, press the SHIFT button and the display
will show TEMPT 1 in the lower half of the display, the note to enter the temperament offset for
and display the present cents offset. Once the correct cents offset for the temperament is
displayed, press the SHIFT button to store the desired cents offset. The next note is displayed
after pressing the SHIFT button, now use the CENTS button to change the cents offset. While in
the desired TEMPERAMENT the NOTE up and NOTE down buttons work to review the stored
information. If upon checking there is an error in the offset, just use the CENTS buttons to correct
the error and press the SHIFT button to store the correct offset.
AUTO STEPPING ADJUSTMENT
The Accu-Tuner IV auto stepping is much quicker to step up then the Accu-Tuner III. Some
technicians have loved the new speed; other technicians preferred a little slower auto stepping
speed. Now the choice is up to you, with this menu choice the stepping delay is adjustable from
one to ten. Setting one is the standard setting when the Accu-Tuner IV is delivered from the
factory and you can adjust the delay to ten which will slow the stepping way down. If you find
the stepping quicker than you prefer, try setting this function up to five (follow the procedure
below) , try out the new delay on a piano and decide whether to increase or reduce the delay to
your preference.