Overdrive effects pedal for electric bass guitar that is based on the saturation channel of Aguilar's celebrated AG 500 bass head and capable of producing everything from warm, tube-like overdrive to full on distortion, providing the grind that is needed without sucking out the low end. It offers a wealth of overdriven sounds within an easy to use, 4-knob layout. The Saturation control offers a tremendous range of distortion while the Contour control allows user to dial in a scooped or a more aggressive boosted midrange sound. The Presence knob adds the right amount of 'attack' ensuring that the bass remains defined even with the most saturated settings. The output level control guarantees that user will be able to get the distortion he wants at any volume level. The pedal also has a gig-saver bypass (signal passes even if your battery dies) and is powered by a nine-volt battery or optional universal power supply. Silver Anniversary Limited Edition.