Big Muff tone control

The passive "Big Muff tone control", originating from Electro-Harmonix's Big Muff Pi, has become a popular circuit building block, mainly due to its simplicity and versatility.

Standard circuit

The standard BMtc circuit doesn't have a flat frequency response in its "neutral" position. This is what the frequency response looks like when the potentiometer's centered.

Schematic

Wiring diagram

AMZ tone control

This improved version of the BMtc offers a second potentiometer, "Body", which controls the depth of the mid frequency notch, effectively being able to achieve a nearly linear response.

Schematic

Wiring diagram