A late-70s variant of the Big Muff, popularized by Billy Corgan of The Smashing Pumpkins, known for its crunchier, more aggressive sound.
Guitarists found the Op-Amp Big Muff Pi to deliver a unique and versatile fuzz sound, particularly enjoying its ability to create the iconic sound of The Smashing Pumpkins. Users praised the pedal's ability to produce a wide range of tones, from crunchy high-end to thick, saturated fuzz. Many reviewers were satisfied with the pedal's performance, ease of use, and ability to capture the desired sound. Some reviewers noted that the pedal's characteristics could be customized by adjusting settings and pairing it with different amplifiers.