This triumvirate is an early one, with an internal gain pot to adjust the amount of gain on tap. Goes from a light blues crunch to high gain metal, and the pedal itself can go from clean to any point in between. Can't get them like this anymore. Works awesome as a boost pedal or even an EQ too. Very versatile.. Check out YouTube to see this thing in action.
Sounds awesome, but I just got a Pod HD500, so really have no need for it.
Also works awesome with bass or keyboards.