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Thank you for purchasing the
Korg OT–120 Orchestral
Tuner. Before you use the OT–
120, please read this owner’s
manual carefully and use the
unit as directed. After you
have read the manual, keep it
for future reference.
Precautions
Location
Using the unit in the following locations can result in a malfunction.
• In direct sunlight
• Locations of extreme temperature or humidity
• Excessively dusty or dirty locations
• Locations of excessive vibration
• Close to magnetic fields
Power supply
Please connect the designated AC adapter to an AC outlet of the correct voltage. Do not
connect it to an AC outlet of voltage other than that for which your unit is intended.
Interference with other electrical devices
Radios and televisions placed nearby may experience reception interference. Operate this unit
at a suitable distance from radios and televisions.
Handling
To avoid breakage, do not apply excessive force to the switches or controls.
Care
If the exterior becomes dirty, wipe it with a clean, dry cloth. Do not use liquid cleaners such as
benzene or thinner, or cleaning compounds or flammable polishes.
Keep this manual
After reading this manual, please keep it for later reference.
Keeping foreign matter out of your equipment
Never set any container with liquid in it near this equipment. If liquid gets into the
equipment, it could cause a breakdown, fire, or electrical shock.
Be careful not to let metal objects get into the equipment. If something does slip into the
equipment, unplug the AC adapter from the wall outlet. Then contact your nearest Korg
dealer or the store where the equipment was purchased.
THE FCC REGULATION WARNING (for U.S.A.)
This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This
equipment generates, uses, and can radiate radio frequency energy and, if not installed
and used in accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and on, the
user is encouraged to try to correct the interference by one or more of the following
measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
Unauthorized changes or modification to this system can void the user’s authority to
operate this equipment.
CE mark for European Harmonized Standards
CE mark which is attached to our company’s products of AC mains operated apparatus
until December 31, 1996 means it conforms to EMC Directive (89/336/EEC) and CE mark
Directive (93/68/EEC).
And, CE mark which is attached after January 1, 1997 means it conforms to EMC Directive
(89/336/EEC), CE mark Directive (93/68/EEC) and Low Voltage Directive (73/23/EEC).
Also, CE mark which is attached to our company’s products of Battery operated apparatus
means it conforms to EMC Directive (89/336/EEC) and CE mark Directive (93/68/EEC).
IMPORTANT NOTICE TO CONSUMERS
This product has been manufactured according to strict specifications and voltage
requirements that are applicable in the country in which it is intended that this product
should be used. If you have purchased this product via the internet, through mail order,
and/or via a telephone sale, you must verify that this product is intended to be used in the
country in which you reside.
WARNING: Use of this product in any country other than that for which it is intended
could be dangerous and could invalidate the manufacturer’s or distributor’s warranty.
Please also retain your receipt as proof of purchase otherwise your product may be
disqualified from the manufacturer's or distributor’s warranty.
© 2005 KORG INC.
Front and side panels
AUTO : Auto Meter mode (SLOW, MEDIUM, FAST)
MANUAL : Manual Meter mode
SOUND : Sound, Sound Back mode
Reference pitch (calibration)
Remaining battery amount (four steps)
LCD display
Meter
Reference
pitch volume
Tuning guide
(two steps)
Key, Temperament name
Internal mic
Note name, Octave
NOTE[√]/[®]
switches
[TRANS/TEMPERAMENT] switch
CALIB[√]/[®]
Power switch (STANDBY/ON/
)
switches
[MODE] dial
DC IN connector
(connect AC adapter)
OUTPUT jack
INPUT jack (input)
(output)
Tuning procedure
The OT–120 provides four modes: Manual Meter, Auto Meter (
SLOW/
), Sound, and Sound Back.
MEDIUM/FAST
■ Preparations for tuning
1. If you are using an instrument with a pickup or contact mic, connect the
INPUT jack of the OT–120 to the cable (plug) from your instrument or
mic.
If the OUTPUT jack of the OT–120 is connected to an amp, the sound that is
input to the INPUT jack will be output without change. Since this may cause
noise during your performance, set the power switch of the OT–120 to
STANDBY .
If you are using the internal mic of the OT–120, tune without connecting a
plug to the INPUT jack and OUTPUT jack. If a plug is connected to the
INPUT jack or OUTPUT jack, the internal mic cannot be used.
The INPUT and OUTPUT jacks are for mono use only. Stereo plugs cannot be
used.
2. Turn the power switch to ON or
. (At the
position, the power will be
on and the display will be illuminated.)
When the power is on, the last-selected reference pitch (default: A=440 Hz)
and the mode last selected by the [MODE] dial will be active.
3. If you wish to change the reference pitch (calibration), press the CALIB
[√] or [®] switch.
Each time you press the switch, the reference pitch will change, and will be
shown in the display. If you press and hold the switch, the setting will
change continuously.
4. If you are tuning a transposing instrument or tuning to a classical scale,
press the [TRANS/TEMPERAMENT] switch.
Each time you press the switch, the setting (key, temperament) will change,
and will be shown in the display.
If you select a key, the characters “TRANS” will blink in the LCD display.
If you select a temperament, the setting will blink in the LCD display.
(Not display for C)
P
M
M
G
: Pythagorean
E
: Mean Tone E
D
: Mean Tone D
W
K
K
M
: Werckmeister III
B
: Kirnberger III
N
: Kellner
V
Y
T
: Vallotti
G
: Young
When a classical temperament is selected, the reference pitch will be A (=+/-0
cents).
■ Manual meter mode
In this mode you can tune to a note name that you specify.
1. Make the settings described in steps 1–4 of “Preparations for tuning.”
2. Set the [MODE] dial to MANUAL.
3. Press the NOTE [√] or [®] switch to select the note name (C–B) that you
wish to tune.
Each time you press the switch, the note name will change in semitone
steps. If you press and hold the switch, the note name will change continu-
ously.
This setting will be remembered even if you change modes.
4. Play a single note on your instrument, and tune so that the VU style meter
moves to the 0 position (center) and the tuning guide indicators are both
lit.
The meter will operate when the difference between the specified note and
the input pitch is in the range of -500 cents – +500 cents.
■ Auto meter mode
In this mode you can tune any note you input.
1. Make the settings described in steps 1–4 of “Preparations for tuning.”
2. Set the [MODE] dial to AUTO-SLOW, AUTO-MEDIUM, or AUTO-FAST.
AUTO-SLOW: The VU style meter will respond slowly to the input sound.
AUTO-FAST: The VU style meter will respond rapidly to the input sound.
AUTO-MEDIUM: The response will be between that of AUTO-SLOW and
AUTO-FAST.
3. Play a single note on your instrument.
The LCD display will indicate the closest note name and the octave for the
pitch that you played.
Tune your instrument approximately so that the correct note name is
displayed.
4. Tune your instrument so that the VU style meter moves to the 0 position
(center) and the tuning guide indicators are both lit.
The meter will indicate the difference between the specified note and the
input pitch in the range of -50 cents – +50 cents.
If you use the internal mic of the OT–120 to tune, place your instrument as
close as possible to the internal mic so that extraneous sounds are not picked
up by the mic.
In some cases, such as when the sound contains numerous overtones, the OT–
120 may have difficulty detecting the pitch. If this occurs, change the volume
or octave, and try again.
■ Sound mode
In this mode you can tune to a reference pitch sounded by the OT–120.
1. Make the settings described in steps 1–4 of “Preparations for tuning.”
2. Set the [MODE] dial to SOUND-
or SOUND-
.
The
setting produces a low-volume reference tone. The
setting
produces a loud reference tone.
3. Press the NOTE [√] or [®] switch to select the note that you wish to tune.
Each time you press the switch, the reference pitch will change in semitone
steps over a five octave range of C2–C7.
This setting is remembered even if you change modes.
4. Tune your instrument to the reference pitch that is output by the OT–120.
■ Sound Back mode
This mode outputs the reference pitch that is closest to the note you input via
the INPUT jack, and displays the difference between your note and the
reference pitch in the meter.
1. Make the settings described in steps 1–4 of “Preparations for tuning.”
2. Set the [MODE] dial to SOUND BACK -
or SOUND BACK-
.
The
setting produces a low-volume reference tone. The
setting
produces a loud reference tone.
3. Play a single note on your instrument.
The reference pitch closest to the note that you played will be sounded, and
the note name will be displayed in the LCD. The meter will indicate the
difference between the specified note and the input pitch in the range of -50
cents – +50 cents. Tune your instrument approximately so that the correct
reference pitch is sounded.
4. Tune your instrument according to the reference pitch and the VU style meter .
Replacing the batteries/Memory function
When the batteries run down, accurate tuning will no longer be possible.
When directed by the low battery indicator in the LCD, replace the batteries as
soon as possible.
The batteries are also used to maintain the contents of memory when the
power is off in order to preserve the reference pitch, TRANS/TEMPERA-
MENT setting, and the note name selected in Manual Meter mode or Sound
mode (Memory function).
The various settings of the Memory function will be reset when you remove
the batteries or when the batteries run down. (If the AC adapter is plugged in
and connected to the OT–120, these settings will not be reset.)
You should leave the batteries installed even when using the OT–120 with its
AC adapter.
1. Press lightly and slide in the
direction of the arrow to open
Adjustment screw
the lid of the battery case.
3. Close the lid of the battery
2. Insert two AAA
case.
batteries. Be careful to
observe the correct
polarity (+, -).
Adjusting the zero point of the VU style meter
If the OT–120 is jarred while being transported etc., or due to normal aging
after extended use, the VU style meter may drift away from the 0 position
(center). Please re-adjust the VU style meter to the 0 position so that tuning
will be accurate.
1. While holding down the NOTE [√] switch, turn the power switch ON
and verify that the VU style meter points to the 0 position.
2. If it does not point to 0, open the battery case lid as shown in the diagram
for “Replacing the batteries/Memory function,” and use a small Phillips
screwdriver (jeweler's screwdriver) to rotate the adjustment screw until
the VU style meter points to 0.
3. After completing the adjustment (or if the VU style meter already points
to 0), press any switch to return to normal operation, and close the lid.
Specifications
Scale
: 12 equal tempered, Pythagorean, Mean tone E /D ,
Werckmeister III, Kirnberger III, Kellner, Vallotti, Young
Transposition range
: C, C , D, E , E, F, F , G, G , A, B , B
Detection range
: A0 (27.50 Hz)–C8 (4186 Hz)
Reference tone
: C2 (65.41 Hz)–C7 (2093 Hz) five octaves, two volume levels
Tuning modes
: Manual, Auto (SLOW, MEDIUM, FAST), Sound, Sound Back
Calibration range
: A4=349–499 Hz (1 Hz steps)
: +/-1 cent
Detection accuracy
: +/-1.5 cents
Sound accuracy
Tuning guide range
: for AUTO (SLOW, MEDIUM, FAST), SOUND BACK modes
-50 cents – -3 cents
:
-3 cents – +3 cents
: ,
+3 cents – +50 cents
:
for MANUAL mode
-500 cents – -3 cents
:
-3 cents – +3 cents
: ,
+3 cents – +500 cents
:
: INPUT (1/4” mono), OUTPUT (1/4” mono),
Connectors
DC IN (9V
)
Power supply
: AAA batteries x 2 (3 V), or AC adapter
Battery life
: approximately 100 hours (alkaline batteries,
Meter mode, continuous input at A4)
Dimensions (W x D x H)
: 74 x 120 x 36 mm [2.91” x 4.71” x 1.42” ]
Weight
: 193g [6.8 oz] (with batteries)
Included items
: Alkaline AAA (LR03) batteries x 2 to verify operation
Options (sold separately)
: AC adapter (9V
)
* Appearance and specifications are subject to change without notice.
Using the stand
By opening the stand located on the back, you can position the OT-120 at a
convenient angle.
The VU style meter may drift from the
0 position (center) when the OT–120 is
tilted. If this occurs, perform the
procedure described in “Adjusting the
zero point of the VU style meter” while
the unit is tilted, so that the VU style
meter points to 0.
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