Boss AD-8 Acoustic Guitar ProcessorThe BOSS AD 8 Acoustic Guitar Processor uses COSM modeling technology to transform the piezo pickup sound of an ordinary acoustic into six high end acoustic guitars. The versatile AD 8 can also simulate the warm sound created by miking the guitar's neck and body, a world's first! BOSS AD 8 Acoustic Guitar Processor Features at a Glance: Floor based acoustic guitar processor featuring COSM Acoustic Guitar Modeling technology Turns ordinary piezo