At2 - Korg

Let's talk numbers. Standard chromatic tuners offer accuracy between ±1 cent and ±3 cents. A cent is 1/100th of a semitone; most human ears cannot distinguish a 1-cent error in a complex mix. However, for unison playing (two violins playing the same note) or for setting the intonation on a fretless bass, 1 cent is a canyon.

The Korg AT2 boasts an incredible accuracy of ±0.1 cent when used in "Fine" mode.

How does it achieve this? The AT2 uses a sophisticated PLL (Phase Locked Loop) circuit and a high-mass, shielded input jack. It processes the fundamental frequency of your note while filtering out overtones and room noise. Unlike smartphone apps that struggle with low B notes on a 5-string bass, the AT2 locks onto E0 (20.60 Hz) without flinching.

✅ No Screen Diving: Most arranger keyboards rely on complex menus. The AT-2 uses a simple button/LED interface—once set up, you just play.
✅ Great Sounding for Its Age: Even by today’s standards, the acoustic piano, drum kits, and jazz guitar sounds hold up remarkably well.
✅ MIDI Learn Function: Assign almost any control to incoming MIDI messages.
✅ Independent Mix Output: Stereo line outs plus a headphone jack with dedicated volume.

Time required: 5–15 minutes after your first practice.

Buy it if: You play clarinet, flute, trumpet, sax, or trombone in a group setting. The vibration mode and reversible screen are killer features. korg at2

Skip it if: You play guitar, bass, violin, or only need a cheap backup tuner.

Rating: ★★★★½ (4.5/5)
Best for: Students & pros needing a rugged, band-friendly tuner.
Price-to-performance: Excellent ($25–35 USD).

The Korg AT-2 (Auto Tuner) is a vintage, Japanese-made chromatic tuner designed for various stringed instruments, including guitars and basses. Recognized for its reliability and precision, it serves as a robust solution for musicians in both studio and stage environments. Core Functionality & Design

Automatic Chromatic Tuning: Detects notes across a wide range, allowing for versatile instrument tuning.

Needle-Style Meter: Features a classic analog VU-style needle supplemented by LED indicators (Flat/Sharp) for highly visible pitch feedback. Let's talk numbers

Bypass Capability: Includes a bypass jack, which allows the tuner to remain in the signal chain during a live performance.

Built-in Microphone: Equipped with an internal condenser microphone for tuning acoustic instruments without needing a direct cable. Technical Specifications Origin Manufactured in Japan Power Supply Single 9V battery Input/Output 1/4” mono phone jacks Dimensions 133(W) x 67(D) x 34(H) mm Weight ~180g including battery Operating Instructions

Connection: Plug electric instruments into the INPUT jack using a standard cable. For acoustic instruments, place the tuner near the sound source to use the built-in mic.

Detection: Play a single note. The tuner will automatically identify the pitch.

Adjustment: Watch the needle and LEDs. A center needle position and a green/stable light indicate the note is perfectly in tune. Red LEDs typically indicate if the note is sharp or flat. The AT2 utilizes a large, backlit LCD combined

For those looking to maintain a vintage setup, the Korg AT-2 remains a popular choice on marketplaces like Reverb and eBay due to its historical reliability.

The AT2 utilizes a large, backlit LCD combined with a high-resolution LED meter. The layout is intuitive:

In low-light stage conditions, the green backlight activates, turning the AT2 into a beacon of pitch security. The contrast is adjustable, which is a lifesaver for outdoor gigs in direct sunlight.

The AT-2 (Automatic Accompaniment 2) is a compact, standalone sound module that generates real-time musical backing tracks. You control it via MIDI (most commonly from a keyboard), triggering chords and selecting styles while the AT-2 produces bass, drums, chords, and additional instrumental lines that follow your playing. It’s essentially the "brains" of an arranger keyboard in a palm-sized box.

Engineers love the AT2 because it has a "Mute" function. You can plug the bass directly into the AT2, then out to the amp. The engineer can hit "Mute" on the tuner, tune silently while the drummer takes a water break, and then unmute without a single "pop" or "thump" through the console.