The JHS Mary-K Fuzz is a replica of an under-the-radar Japan-made fuzz circuit of the '60s known as Key Fuzz Tone. Its maker, Kay Musical Instruments, released a series of streamlined pedal effects in the late '60s that didn't have any knobs, but that allowed one parameter of the effect to be modified via foot through a treadle, just like a wah pedal.... Click on the title for more