Used BOSS SD1 Super Overdrive Keeley Mod Effect Pedal

Used BOSS SD-1 Super Overdrive with Keeley Mod in fair condition. This classic pedal features asymmetric overdrive for tube-like tones, enhanced by Keeley's mod for improved clarity, smoother distortion, and better bass response. Standard 3-knob layout: Level, Tone, and Drive. True bypass added in mod for cleaner signal path. Shows wear from use but functions properly—perfect for players seeking vintage tone with boutique enhancements at an affordable price.