DigiTech’s Mosaic Polyphonic 12-String pedal is designed to help electric or amplified acoustic guitars create a 12-string sound with octave low and doubled high strings. It offers a balanced low-end response with octave shimmer using independent Level and Tone controls; Level controls intensity while Tone shapes the overall brightness. Wired for true-bypass, it can operate on AC or DC power. See more at http://digitech.com.