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.
However, the AT-1 had one major limitation: it was designed primarily for tempered tuning (standard 12-tone equal temperament). As music became more sophisticated, and as interest in just intonation, pure thirds, and vintage synthesis grew, Korg realized they needed an upgrade. korg at2
: 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. The AT-2 (Automatic Accompaniment 2) is a compact,