Mad Professor Stone Grey Distortion demo by Marko Karhu

Mad Professor Pedals | 9 years ago

Mad Professor Stone Grey Distortion with Little Green Wonder for heavy tones by Marko Karhu

Mad Professor Pedals | 9 years ago

Mad Professor Stone Grey Distortion Part 2 (with humbuckers)

Mad Professor Pedals | 9 years ago

Mad Professor Stone Grey Distortion demo: Part 1

Mad Professor Pedals | 9 years ago

Mad Professor pedals played by Ben Granfelt

Mad Professor Pedals | 6 years ago