I would go w what thegame said. That being said, all I know is that turning it made it go thin and have a sweep I did not like at all, too much the other way was too much as well. I would have to pop mine open to see where it is set but I have a nice sweep on it. The only Wah I have been able to get that fat, full sound with. The several others I tried just didn't have that. Don't recall the several I have tried other than my Bad Horsie 2 I have had since I was 15.