Electro Harmonix Big Muff Pi Tone Wicker

The Big Muff Pi with Tone Wicker taps into the sonic power of the legendary Big Muff Pi, but creates new tonal possibilities at the flick of a switch — or two. Use the Wicker switch to open up three high-frequency filters. True bypass
The Wicker switch opens up 3 high frequency filters providing a sustain that is raspy and defined
The Tone switch completely removes the tone control, providing you with a devastating broadband Big Muff slam!
With the Wicker switch off and the Tone switch on, you have the original Big Muff Pi