Pros:
For musicians who perform solo—singers, instrumentalists, or keyboardists—adding a full, dynamic rhythm section can transform a performance. The Korg AT-2 is a small, dedicated automatic accompaniment unit designed to do exactly that, without requiring a full arranger workstation or a laptop on stage.
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. korg at2
Since the AT-2 is discontinued, consider these alternatives:
Beyond the historical presets, the AT2 allows you to create three user-defined temperaments. You can manually adjust the pitch of all 12 notes (in cents) to match a specific piano that has drifted over time, or to create a microtonal scale for experimental jazz. This feature alone pushes the AT2 out of the "guitar tuner" category and into the realm of acoustic analysis tools. Operation principle:
The AT-2 consists of two main parts:
Operation principle:
Because the felt strip physically mutes the strings, there is zero acoustic bleed – perfect for night practice.
The Korg AT-2 was a brilliant piece of engineering – a portable, reversible silent system that turns any compatible acoustic piano into a practice instrument with headphone output, transposition, and MIDI. If you find a used unit in good condition and it fits your piano, it is absolutely worth buying. For those who can’t find one, modern alternatives exist, but few match the AT-2’s combination of simplicity, low latency, and zero acoustic bleed. Tip: Before buying a used AT-2
Tip: Before buying a used AT-2, download the installation template from Korg’s legacy support site and verify it matches your piano’s hammer rail distance. Without that, the unit is unusable.
Note: I assume you meant the AW-AT2 (Aircraft Wind/AT series), as there is no standalone "Korg AT2." If you meant the AT-12 (or a different model), please clarify, but the AW-AT2 is Korg’s most popular wind/brass tuner.