The BD-2/Super can get a VERY pure clean boost sound after our mod, more transparent than a tube screamer due to less midrange boost, compression, and distortion. We tuned this mod so that when you put the gain knob all the way down, and the volume and tone knobs at 12:00, you cannot tell if the pedal is on or off. Then you can just turn up the volume knob for your amount of CLEAN BOOST. On the other end, the BD-2/Super has more available distortion than a Tube screamer. It really has a wide range of excellent tones. If the gain knob is up, you can get cleaner sounds as you turn your guitar down, like our Sunface fuzz pedal.