KORG OT-120 Orchestral – Chromatic Tuner for Orchestral Instruments with Sound Back and Historical Temperaments

KORG OT-120 Orchestral – Chromatic Tuner for Orchestral Instruments with Sound Back and Historical Temperaments

The KORG OT-120 is a high-precision orchestral chromatic tuner for wind, string, and keyboard instruments. Its dual display combines a highly visible needle-type indicator with a backlit LCD and LEDs that confirm deviation or perfect tuning even in dimly lit venues. It offers an 8-octave detection range (A0–C8) , wide calibration A4 = 349–499 Hz in 1 Hz steps, and three-speed needle response (SLOW/MEDIUM/FAST) to match your playing style. The unique Sound Back mode automatically generates a reference tone for the closest note to the one you're playing while the meter indicates the deviation: you can tune "by ear and by sight" at the same time, ideal for tuning training and lessons.

The OT-120 features a 12-key transposition function (C, C♯, D, E♭, E, F, F♯, G, G♯, A, B♭, B) for wind instruments, and a full selection of historical temperaments as well as modern ones : Pythagorean, Werckmeister III, Vallotti, Mesotonic (E♭ and D♯), Kirnberger III, Young, and Kellner . It can output a reference tone through its internal speaker over a five-octave range (C2–C7) with two volume levels, and includes a microphone for acoustic guitars, as well as a 1/4" jack input/output for working with pickups or contact microphones and sending the signal to an amplifier. The vertical design with rear stand makes it easy to use on a music stand. Powered by 2x AAA batteries (battery life approx. 100 h ) or 9V DC adapter . Includes a carrying case .

Main features

• Dual display : needle type meter + LCD with backlight and status LEDs.
• Detection range : A0–C8 (8 octaves); accuracy ±1 cent .
• Wide calibration : A4 = 349–499 Hz (1 Hz steps); reference pitch C2–C7 (5 octaves).
• Sound Back Mode : Generates a reference tone of the nearest note and simultaneously displays the deviation on the meter.
• Transposition : 12 clefs (C, C♯, D, E♭, E, F, F♯, G, G♯, A, B♭, B) for wind instruments.
• Temperaments : Equal (12-TET), Pythagorean, Werckmeister III, Vallotti, Mesotonic (E♭), Kirnberger III, Young, Mesotonic (D♯) and Kellner.
• Tuning modes : AUTO (SLOW/MEDIUM/FAST), MANUAL and SOUND BACK .
• Connectivity : INPUT 6.3 mm, OUTPUT 6.3 mm (thru), DC IN 9 V ; built-in microphone and speaker with 2 levels.
• Design : Vertical format with large dial and rear stand for standing.
• Battery life : approx. 100 hours with alkaline batteries (in meter mode, without backlight).
• Dimensions and weight : 74 × 120 × 36 mm ; 193 g (including batteries).
• Includes : suede-tone case and 2× AAA for operation check.

Product benefits

• Clear and reliable reading : needle + LCD + LEDs for precise tuning in any environment.
• Ear training : Sound Back allows you to train your ear by tuning both by tonal reference and by meter.
• Orchestral versatility : transposition in 12 clefs and eight historical temperaments for period instruments or classical repertoire.
• Easy integration : 6.3mm input/output, internal microphone and C2–C7 tone output with two levels.
• Portability : up to 100 hours with 2x AAA and inclusion of case for transport and protection.

Use cases

• Woodwind and brass : tuning with key transposition and stability control with adjustable needle speed.
• Bowed string : use with internal or contact microphone and C2–C7 reference for intonation work.
• Keyboards and pianos : quick verification in repertoires with historical tunings.

Description for projects

Orchestral chromatic tuner; detection range A0–C8 (±1 cent); A4 calibration = 349–499 Hz (1 Hz); AUTO (SLOW/MEDIUM/FAST), MANUAL, and SOUND BACK modes; reference pitch C2–C7 with 2 levels; transposition in 12 clefs (C, C♯, D, E♭, E, F, F♯, G, G♯, A, B♭, B); temperaments: Equal, Pythagorean, Werckmeister III, Vallotti, Mesotonic (E♭/D♯), Kirnberger III, Young, Kellner; INPUT/OUTPUT 6.3 mm and DC IN 9 V connectors; built-in microphone and speaker; power supply 2 × AAA or 9 V adapter; battery life approx. 100 h; dimensions 74 × 120 × 36 mm; weight 193 g; includes case.