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Mad Professor Stone Grey Distortion Guitar Effects Pedal  

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The new Mad Professor Stone Grey Distortion (SGD) is a modern high-gain distortion pedal with unparallelled clarity and definition. This pedal was de...Read More

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See All Mad Professor Overdrive, Distortion, Fuzz & Boost Effects Pedals

A BJF designed distortion pedal with great clarity and definition.

The new Mad Professor Stone Grey Distortion (SGD) is a modern high-gain distortion pedal with unparallelled clarity and definition.

This pedal was developed for high gain applications and specifically for clarity at heavy distortion levels. The Stone Grey Distortion is unique in that it has razor sharp dynamics and high gain intensity. It's ready for drop tuning, 7 string, and modern rock players who are seeking extreme gain with intense "string to string definition". Play a chord and hear each note distinctly, instead of it turning to "mush" like many other high gain pedals.

With the gain turned down, the Stone Grey Distortion approaches overdrive-like textures and responds to the player's touch and dynamics like other Mad Professor pedals do.

  • VOLUME: sets the output level of the distorted signal
  • DISTORTION: sets the level of distortion - lower levels more overdrive-like textures - higher with heavier distortion.
  • TONE: sets the critical treble response for use with various amplifiers.

Built the Mad Professor way: small footprint and big tone.


Stone Grey Distortion Guitar Effects Pedal

  • Input impedance: approximately 500K Ohm's
  • Recommended output load: 50K Ohm's or higher
  • Current consumption: @ 9V DC approximately 8mA
  • DC supply voltage range: 7,5- 15V
  • True bypass

Review Snapshot®

by PowerReviews
Mad ProfessorStone Grey Distortion Guitar Effects Pedal

(based on 1 review)

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Reviewed by 1 customer

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loved it!

By rmndportillo

from Miami Florida

About Me Professional Musician


  • Compact Design
  • Excellent Sound Quality
  • Good Selection Of Effects
  • Great Clarity
  • Responsive
  • Versatile


    Best Uses

    • Amateur Recording
    • Events
    • Home Studio
    • Performances
    • Professional Recording

    Comments about Mad Professor Stone Grey Distortion Guitar Effects Pedal:

    I loved the clarity note by note. I will definitely recommend this amazing pedal to my friends. It reaches nice strong modern distortion tones and goes down to super cool overdrives. I am glad to have this in my board.

    Comment on this review

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