The Flattley Joker is a boutique UK made guitar overdrive and boost pedal that uses an FET based 12AX7 valve simulation to produce tube like tones. It offers two modes called Dirt and Filth. The Dirt mode delivers a warm boost that can reach classic tweed style crunch, while the Filth mode provides higher gain distortion for rock tones. The controls include Volume, Gain, Tone, and a mode toggle switch. It is designed for use from jazz and blues to rock and can also function as a tone enhancing boost ahead of an amplifier. It includes a green halo LED and an aluminum foot topper for better visibility on stage.