KORG GA Custom - High-precision chromatic tuner with 3D meter

KORG GA Custom - High-precision chromatic tuner with 3D meter

The KORG GA Custom is a chromatic tuner from the “Custom Shop” series designed to offer professional precision in a compact card-like format. Its 3D visual meter provides a clear and fast reading even in challenging environments, and its accuracy of ±0.1 cent allows for fine adjustments with complete confidence. Three display modes (Regular, Strobe, and Half-Strobe) allow the musician to choose the response that best suits their tuning style. Thanks to the built-in high-sensitivity microphone, it can be used with guitar, bass, and acoustic or orchestral instruments, and supports wired connection with a 6.35 mm input and output bypass.

Main features

• Ultra-high precision: ±0.1 cent for extremely accurate tuning.
• 3D Visual Meter: LEDs with a three-dimensional effect make it easy to read the pitch deviation at a glance.
• Three measurement modes: Regular, Strobe and Half-Strobe, selectable from the DISPLAY button.
• Use with acoustic and electric instruments: high-sensitivity internal microphone and INPUT and BYPASS/OUTPUT connectors (6.35 mm mono jack).
• Detection range: A0 (27.50 Hz) – C8 (4186 Hz) to cover everything from double bass to high-range instruments.
• Adjustable calibration: A4 = 436–445 Hz in 1 Hz steps.
• Input impedance: 1 MΩ (tuner on).
• Slim, portable design: Compact body, rubberized exterior for better grip, and large display; includes a flip-up stand with a pen slot.
• Optimized battery life: up to approximately 50 hours in Regular mode with 2 AAA batteries (manufacturer's standard test conditions).
• Practical functions: calibration memory and display mode (retained when switched off), auto-off after ~3 minutes of non-use.
• Accessory Compatibility: Supports KORG CM-200 contact microphone (optional).
• Dimensions and weight: 99 × 65 × 16 mm; 83 g (with batteries).

Product benefits

• Faster, more confident tuning: 3D gauge and strobe modes simplify fine-tuning without hesitation.
• True versatility: Use it with wired guitar and bass or acoustic instruments thanks to the built-in microphone.
• Easy integration into your rig: the BYPASS/OUTPUT output lets you keep the signal going to your amp or pedalboard while you check your tuning.
• Consistency across any repertoire: Calibrate to 442 Hz for orchestral repertoire, or to 440 Hz/other values ​​as required by the project.
• Uncompromising portability: Pocket-sized and built for everyday use in rehearsal, on stage, or in the studio.

Use cases

• Daily tuning of wired electric guitar and bass.
• Tune acoustic guitars and basses, wind instruments, and bowed strings using the built-in microphone or a contact microphone.
• Fifth/intonation work and bridge adjustments thanks to ±0.1 cent accuracy.

Frequently Asked Questions

Can I use the internal microphone if a cable is connected?
No. When you connect a jack to INPUT/OUTPUT, the internal microphone is disabled; to use it, unplug the jacks.

What is the difference between Regular, Strobe and Half-Strobe?
Regular lights the green LED while tuning; Strobe "runs" the LEDs until they freeze while tuning; Half-Strobe combines both for a highly accurate reading.

Does the tuner save my preferred calibration?
Yes, the calibration and display mode are retained when the power is turned off. They are reset when the batteries are removed.

Does it have an automatic shut-off function?
Yes, it automatically shuts off after approximately 3 minutes of non-operation.

Recommendations for use and care

• For more stable readings with acoustics, use a contact microphone (e.g., KORG CM-200) attached to the instrument.
• Avoid prolonged exposure to extreme heat or humidity and clean the exterior with a dry cloth.

Description for projects

KORG GA Custom Chromatic Tuner with 3D Visual Meter and ±0.1 cent accuracy; A0–C8 detection range; A4 calibration 436–445 Hz (1 Hz); Regular/Strobe/Half-Strobe display modes; built-in microphone; INPUT and BYPASS/OUTPUT connectors (6.35 mm mono jack); 1 MΩ input impedance; Auto power off ~3 min; Settings memory; 2× AAA power supply; Dimensions 99 × 65 × 16 mm; Weight 83 g; Includes 2 AAA batteries for verification; Compatible with CM-200 contact microphone.