The Ernie Ball Expression Overdrive delivers natural tube-like overdrive with more range than ever before. It features settings for drive, boost and tone, with a foot-sweepable overdrive control, making it effortless to go from clean to searing lead tones and everything in between, all without taking your hands off the guitar. Each component was carefully designed for the highest sound quality and performance available. The sleek, compact design maximizes playability, while minimizing the footprint on your pedal board. Unlock a virtually limitless tonal palette that simply can't be matched by traditional "on/off" stompboxes. The Expression Series' innovative design provides continuous, usable tonal control at your feet throughout the pedal's entire range of motion without coloring your tone. The pedals provide complete signal transparency in the zero position. Plug in and play this versatile new tool and unleash your creative expression. The sealed aircraft aluminum chassis offers a mechanically and electrically superior experience by protecting internal components from outside elements. Leveraging the 40+ year heritage of our volume pedal, the usability, easy-access controls, and no-slip grip have been incorporated and modernized.