The CostaLab Custom Muff CLASSIC is inspired by the most iconic of all fuzz pedals: the Big Muff with SILICON clipping. But this is far from a simple clone. Its circuit has been re-engineered with specific enhancements to deliver a sound rich in midrange, without the muddy low-end rumble, and with exceptional clarity.

The Custom Muff is a bold reinterpretation of a classic, designed to cut through the mix in any band and under any playing conditions. It’s built to stand out, not get lost.

This is a true rock tone machine, perfectly suited to both humbuckers and single coils. It offers massive gain levels paired with high-definition detail. In solos, the Custom Muff produces a rich, cutting tone that slices through the mix with ease. When playing chords or power chords, it delivers towering walls of sound.

Whether in front of a tube amp or a solid-state setup, the experience is unforgettable. Despite the impressive gain, the pedal stays surprisingly quiet, thanks to a carefully crafted design, premium component selection—especially the transistors—and smart circuit refinements.