I know for this album he uses the famous "Rainbow Bass" which is a fretless. If you listen to songs like "Welcome to this World" or "My Name is Mud" you can hear a cool sounding click for every note he hits. Is this because he plays a fretless? If not, how does he get this sound? Also, you listen to DMV which is tap-tastic, then Welcome to This World which is slap-tastic, then Bob which is mwah-tastic, and this is all on the same bass. How does he get a huge varied sound? And one more question just for giggles, what is that insane sounding distortion he uses in "Fish On" on "Sailing the Seas of Cheese?" When he hits that note, it sounds like a friggin bus just crashed into a cement wall.