The Tone control is atypical for this type of distortion and can drastically change the distortion’s character in conjunction with the Sustain setting. Bass frequencies are boosted clockwise while treble frequencies are boosted when turned counterclockwise. The treble side can go from piercing highs to an aggressive mid-range grind. As the Tone is turned clockwise, the mids become less present, highs are tamed, and a massive, thundering low-end comes to the forefront.
As you might expect, there is plenty of output gain on tap, so be careful. Unity is around 9-10 o’clock and everything above that is set to destroy.