Distortion (High-gain distortion)
The Mad Professor Stone Grey Distortion is an analog high-gain distortion pedal, with Volume, Tone, Distortion controls, made in Taiwan.
| Category | Distortion (High-gain distortion) |
| Signal | Analog |
| Controls | Volume, Tone, Distortion |
| Footswitches | 1 |
| Bypass | True Bypass |
| True bypass | Yes |
| I/O | mono in/out |
| Power | 9V (7.5-15V DC) |
| Power draw | 8 mA |
| Battery power | Yes |
| Country of manufacture | Taiwan |