Bass distortion sounds is something i have struggled with over the years. Most are crap, tried the Muff, wasn't much of a fan.. I have finally settled on the "You Dirty Rat", which is the newest incarnation of RAT pedal. I don't use alot of distortion on the pedal but it does sound fucking ace when ye crank it up. For Bonesaw i prefer to hear the bass tone but the pedal gives it that extra BITE. Sounds nasty, highly recommended. Albie from Filthpact/Ablach uses the Marshall Guvner, which also has a nice nasty distortion tone... Horse for courses though...