TwinStomp S21 Overdrive

The TwinStomp S21 Overdrive is a dual-channel overdrive pedal from TwinStomp, a UK-based company that MusicRadar notes is gaining a reputation for its line of pedals. As the name suggests, it is an overdrive rather than a distortion, sitting in the camp of pedals that take a sound from smooth clipping up to a thicker blues drive, as opposed to the harder clipping of distortion pedals or the fuzzier textures of a fuzz¹.

What it does

The S21 gives the player two overdrive voices on one box. The first channel offers less gain than the second, but both can act as a clean boost if a player wants to push the front of an amp harder, in the manner of a dedicated boost pedal. TwinStomp says channel two has more "edge", though MusicRadar's reviewer found it a subtle difference to their ears¹.

Build and battery holder

TwinStomp makes its own pedal casings rather than using a generic project box, and the S21 sits in a cast stainless steel housing with four removable rubber feet and "ears" that become mounting holes¹.

The pedal also carries a patent-applied-for tool-free battery holder. A 9V-style battery presses into place and is removed by pulling a metal ring, a keyring-style loop attached to a plastic cable-tie, so no screwdriver is needed to swap batteries¹.

What reviewers said

MusicRadar's review was positive on both sound and build. The reviewer's verdict:

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