The 1991 is an op-amp based distortion pedal developed in collaboration with Matt Webster of the Let’s Play All YouTube channel. It is specifically designed to replicate the "mid-forward" guitar tones found on Pearl Jam's debut album, Ten. The circuit architecture utilizes two gain stages running in series, simulating the sound of an overdrive pedal pushing a cranked Marshall-style amplifier. It features a comprehensive three-band EQ for tonal shaping and is capable of ranging from subtle gritty boosts to high-gain lead saturation. The pedal is hand-built in the UK and emphasizes dynamic response to player touch.