The Boss DS-1 Distortion Effects Pedal delivers added sustain and distortion types that range from very soft to very hard.
With its level control, you can set the DS-1 to match your volume level, or to get that boost when you go into a lead. Other controls are tone and Distortion (affects the amount of distortion).
The DS-1 provides a harder distortion effect for guitar and keyboard sounds. Instead of toneless, fuzzy distortion, the DS-1 faithfully reproduces all the subtle nuances of your playing dynamics, from whisper-quiet to screaming loud. The onboard TONE control allows you to tailor the overall sound to your liking.