The Marshall Shred Master is a distortion pedal featuring knobs for Gain, Bass, Contour, Treble, and Volume. This pedal has been famously used by Jonny Greenwood and Thom Yorke of Radiohead, Alex James of Blur, and Kevin Shields of My Bloody Valentine.
It was the high-gain pedal of a triad, also including the Marshall DriveMaster and the Marshall BluesBreaker. All of which were created to represent a certain Marshall Amplifier in an effects pedal.
The pedal is powered by 9V battery or external power supply.