This all analog distortion pedal is built in Japan and has two modes which both expand on the sound of the original - the second highest selling stompbox Boss has ever made - and take guitar tone to new depths of distortion and flexibility. Stock mode delivers the classic Metal Zone tone but with enhanced clarity, definition, and attack responsiveness. Custom mode unleashes a much wider range of tones than previously available, with always-tight bottom end and increased dynamics no matter how high the gain is set, making this pedal a must have for the modern metal player.