Korg At2 -

No product is perfect. The Korg AT2 has a few quirks worth noting:

The Korg AT-2 is a professional-grade, compact chromatic tuner. Unlike standard guitar tuners that are limited to specific notes (E, A, D, G, B, E), a chromatic tuner like the AT-2 can identify any of the 12 notes of the chromatic scale. This makes it compatible with virtually any instrument, from guitars and basses to saxophones, violins, and instruments with alternate tunings.

While Korg has released many tuners over the years, the AT-2 (and its successors in the AT series) is revered for its needle-style meter accuracy packed into a stomp-box-sized chassis.

One of the most underrated features of the AT2 is the built-in speaker for "Sound Out" tuning. Instead of playing your instrument, you press a button, and the AT2 emits a pure sine wave of the target note (A4 = 440Hz, adjustable 410–480Hz). For wind players (oboe, flute) and vocalists, matching pitch to a pure tone is far more effective than watching a needle. The AT2's speaker is loud and clear, cutting through chamber music rehearsal chatter effortlessly. korg at2

At the time of its release, the AT2 faced competition from the Peterson StroboStomp (guitar pedal) and the Boss TU-series.

Verdict: The Boss is bombproof for rock, but inaccurate for acoustic ensembles. The Peterson is arguably more powerful (strobe visualization), but the AT2 wins on utility. You can hand the AT2 to a singer, a flutist, and a bassist in the same session without needing adapters. The Peterson requires a pedalboard; the AT2 sits on a piano lid. No product is perfect

Setting intonation on an acoustic guitar requires watching the 12th fret harmonic vs. the fretted note. The AT2's 0.1-cent resolution reveals the truth. You can see the "ghost bend" of a string settling. The heavy-duty aluminum casing means it survives drops on the workbench.

The Korg AT-2 (Auto-Tuner) is a non-invasive, clip-on silent system for acoustic upright and grand pianos. Unlike traditional silent piano systems that require professional installation (replacing the hammer shanks or adding optical sensors), the AT-2 attaches temporarily to the piano’s action. It allows you to:

It is best described as a smart mute with digital pitch shifting. It is best described as a smart mute

The headline specification of the AT2 is its ability to store 15 different temperaments. While most tuners force you into equal temperament (where every semitone is mathematically identical), the AT2 understands that music is not always mathematically rigid.

❌ No Audio Recording/Playback: It’s MIDI-only. You can’t load MP3 backing tracks or loops.
❌ Style Editing is Limited: You can’t deeply edit or create new styles on the unit—you need external software or the rare Korg style editing tool.
❌ Dated Connectivity: Uses 5-pin DIN MIDI (good), but no USB-MIDI or audio over USB.
❌ Discontinued: Long out of production (early 2000s), so availability is limited to used markets. Prices can vary wildly ($100–$300+).