The Aclam Windmiller Preamp is a versatile preamp‑style guitar pedal inspired by the Grampian 636 Spring Reverb unit’s preamp that Pete Townshend famously used to push his Marshall amps for gritty, saturated tones in the mid‑’60s. It faithfully recreates that classic harmonic character while adding modern refinements, including true bypass switching and Hi‑Cut/Lo‑Cut tone shaping controls to tailor the sound. Players can use it as an always‑on preamp to color their tone, a booster to drive amps and overdrives harder, or a saturation tool to enhance natural amp breakup with rich, musical grit.