As it is the setting of the pedal that determines the amount of distortion the player can adjust this while playing. This is rather unique feature in a distortion pedal. There is also a warp mode where distortion with much higher gain is generated.
About The Author
Florence Munoz founded BossArea.com in 2003 and has written extensively about guitar pedals. Boss Area lists over 150 different pedals of all types produced since 1977. The listings are now on GuitarLessons.org.