Korg AX-10A Acoustic/Electric Modeling Floor Effect Processor Acoustic Modeling Signal Processor Turns your piezo equipped guitar into ten classic acoustic guitars Korg's patented REMS technology provides highly accurate acoustic guitar, effect and microphone models Packed with 80 combination acoustic guitar and effects programs (40 user/40 preset) Loaded with 16 popular effects Unique resonator, nylon and metallic guitar sounds Korg auto chromatic tuner with bypass and mute function Convenient notch filter for feedback elimination 8 knobs for easy editing Expression pedal for real-time control