Used MXR M103 Octave Blue Box Effect Pedal

Add wild, fuzzed-out octave-down effects to your tone with this used MXR M103 Blue Box, in good condition and fully functional. This analog stompbox blends a fuzz circuit with a two-octave-down tone generator to create gritty, synth-like textures. Features include simple controls for Output and Blend, rugged metal housing, and true bypass switching. Perfect for guitarists or bassists seeking bold, experimental sounds with a vintage vibe. Powered by 9V battery or standard adapter.