Used BOSS SD1 Super Overdrive Keeley Mod Effect Pedal

Used BOSS SD-1 Super Overdrive with Keeley Mod delivers smooth, warm overdrive with enhanced clarity and dynamic response. This modded classic features asymmetrical clipping for tube-like tone and improved tone circuitry for increased headroom. Housed in the iconic yellow chassis, it’s in great condition and built to last. Perfect for blues, rock, and beyond, the SD-1 with Keeley Mod runs on a 9V battery or adapter and includes Level, Tone, and Drive controls for precise shaping.