The Tweak Fuzz is a tone shaper, not a tone booster. The Tweak Fuzz design is based on a truly vintage circuit like the old Fuzz Face pedal. Depending on your set-up, you may find that to achieve a proper balance between your clean tone and your fuzz tone, you have to turn the Tweak Fuzz volume almost all the way up. This is normal for just about any type of vintage fuzz pedal. Additionally, since fuzz pedals have such an extreme amount of distortion, they tend to have a very compressed, dark sound. So if you are using a bright clean tone, and then kick in the Tweak Fuzz with the gain cranked up, it is likely that you will need to set the Tweak Fuzz volume rather high in order to avoid losing overall volume when the pedal is engaged.