Yamaha AG-Stomp Acoustic Guitar Pedal Effect Processor Preamp. This unit is in excellent working condition. Shows very minor wear to the finish but really looks good overall. See photos of the actual unit.Lots of great effects that bring your acoustic guitar to life! Comes with original AC Adapter and Owner's Manual. The features are numerous and very useful and can be seen at YouTube if you are unfamiliar with these. Yamaha promoted these in the 1990's as "Studio Quiet and Built for the Road". This unit and thousands like it are proving that to be true. Still the best sounding and most useful pre-amp ever for acoustic guitar. Studio quiet with quality Reverb, Delay and Chorus to add some fullness and texture to your sound. Fantastic sounding must have piece of gear for Acoustic Pros! The item "Yamaha AG-Stomp Acoustic Guitar Pedal Effect Processor Preamp" is in sale since Tuesday, August 21, 2018. This item is in the category "Musical Instruments & Gear\Guitars & Basses\Parts & Accessories\Effects Pedals\Other Guitar Effects Pedals". The seller is "mark_hawkins" and is located in Birmingham, Alabama. This item can be shipped to United States.