The Bad Stone is a phaser pedal by Electro Harmonix. It is a faithful reproduction of the sound of the legendary 'original' Bad Stone from the 70s, but upgraded and adapted to modern needs. Its potentiometers control the rate, feedback, the amount of manual shift lift, and it also features an auto/manual switch. The construction is metallic, sturdy, suitable for heavy use, and of course, it has a true bypass circuit, as well as an on/off LED light.