http://www.gearboxaudio.com The SweetDrive from Gearbox Audio is an incredibly versatile and tweakable overdrive...tune to your tone of choice by blending the first and second gain stages from 4 different stages each...plus, there's a bitchin BOOST in there too! Very cool and groovy...please check out their site for a better explanation that I was able to dribble out, verbally.