Used Donner Mod Square Effect Pedal

This used Donner Mod Square effect pedal delivers bold, choppy modulation with a classic square-wave character, perfect for adding rhythmic pulse to guitar or bass. In good condition, it’s easy to dial in with straightforward controls for rate and depth, letting you go from subtle movement to hard-edged trem-style chops. Compact and pedalboard-friendly, it runs on standard 9V DC power and features a true-bypass design for a clean, unaffected signal when off.