The CS3 compresses high-input signals while boosting low-input signals, giving you smooth sustain without degrading the quality of the original sound. A range of effects from gentle compression to squeezed sounds is at your command. Designed for outstanding low-noise performance, the CS3 also provides EQ for precise sonic control.About Boss PedalsThe history of Boss reads like the history of guitar effects. From their legendary CE-1 chorus pedal (the big gray box that started it all) to the world's favorite line of compact pedals, they've been responsible for more guitar innovations than just about anyone else.Boss's compact pedal line-up began in 1977 with the classic OD-1 Overdrive. Its warm, smooth overdrive sounds and breakthrough Boss pedal features (heavy-duty construction, rubber pads on top and bottom, recessed control knobs, silent switching, a built-in LED, and easy battery replacement) immediately set it apart from other stomp boxes on the market. It established the masterful design for all other Boss effects pedals since.Throughout the years, Boss has continued to define the cutting edge of guitar effects. Double-layer circuit boards allowed pedals like the DD-5 Digital Delay to deliver studio-quality effects comparable to rackmount units. They recently brought bassists and guitarists the first bass synthesizer in a compact pedal, the SYB-3. On their 20th anniversary they proudly introduced the OD-3 Overdrive, a pedal that takes the smooth, dynamic overdriven tones of the legendary OD-1 to a different level. Like all Boss products, it is a level of sound quality and durability that is unrivaled.