Acoustic Guitar Pick-Up with Volume Control AP-2Portable surface mount piezo pickup with volume control for guitar and other instruments. AP 2 is an ideal stick on guitar pickup for acoustic musicians looking for an easy, effective solution to bring their sound to an amp and control volume from the stage. It's ideal for guitarists and cajn players looking for a universal pickup. The design features a handsome, lightweight wooden housing for the passive piezo sensor and high quality volume