The CL1's Tone control makes sound shaping simple. Use the MXR pedal's control to shape your sound to your liking. With this tone control, you can achieve a wide range of sounds, including Texas blues, thrash metal leads, and modern rock flair. The output and gain controls provide ultimate control for any tone at any volume. The MXR effect pedal adds sustain and gain without coloring your guitar or amp's tone. The output dial controls the overall effect volume (inactive in bypass mode). The gain dial controls overall amount of distortion..