The Great Eastern FX Co. Distortion Filter D312A is an analog distortion pedal designed and built in England. It combines distortion with an active filter section inspired by classic studio filter and synthesizer concepts. The pedal produces thick, aggressive distortion that can be sculpted using a resonant low-pass filter control. It is designed to deliver expressive tonal shaping ranging from tight, focused drive to heavily saturated textures. The circuit is fully analog and optimized for interaction with guitar dynamics. It is housed in a robust metal enclosure for pedalboard use.