The Electro-Harmonix Bad Stone phase shifter carries on the legacy of the Bad Stone from the 1970s with faithful circuit design and a three-knob control layout, along with up-to-date enhancements for the modern player.The Bad Stone delivers an incredible six stages of phase shifting plus a manual mode that lets the player freeze the phase. The Rate knob controls the phase shifting speed which goes from a very slow swoosh to a rapid, oscillating warble. Feedback determines the depth of the phase effect and a toggle switch lets the user select Auto or Manual modes.In addition to the die-cast package, other modern amenities include true bypass for maximum signal path integrity, an effect status LED and an AC jack that accepts an EHX9.6DC power supply (sold separately).Electro-Harmonix Bad Stone Features:A faithful reincarnation of the legendary 1970s Bad Stone with carefully selected updates for the modern playerThe Bad Stone was the first phase shifter to employ variable feedback and features an awesome six stages of phase shiftingManual Shift mode that lets you freeze the phaseCompact, rugged die-cast packageTrue bypass switching for maximum signal path integrityEffect status LEDBuilt-in AC jack that accepts an optional EHX9.6DC power supply, comes with a 9V battery Electro-Harmonix BAD-STONE Bad Stone Analog Phase Shifter Guitar Pedal.