The A4 Guitar Effects Processor is a multi-effects unit made by Korg. It is a digital design, so its effects are produced by digital signal processing rather than analog circuitry1.
Power
The A4 runs on 9V DC with a center-negative plug, the standard arrangement for guitar pedals. Its current draw of 350mA is high compared with many single-effect pedals, so it needs a power supply rated to deliver that current on its own rather than sharing a low-output outlet on a daisy chain1.
Manual
Korg's English manual for the A4 is available for download from Korg's support site1.
Related Korg multi-effects
Korg has made a range of multi-effects and effects units for guitar players, including the Korg AX3000G, the Korg AX3G, the Korg Pandora Stomp and the KORG ToneWorks 411FX Multi-Effects.
Videos
Azizie Mislan
GT StaTion
The Rolling Store
Sources (1)
- A4 Guitar Effects Processor by KORG, RockBoard (rockboard.de), 2026
