There are four main control knobs on the pedal - Gain, Treble, Vol, and Bass. Gain allows you to go from a barely noticeable boost to a boost with a hint of fuzz. The Treble and Bass controls are a great way to cut and boost your frequencies even further. So combined these controls allow a great deal of versatility. The CP-18 is durably constructed and should live up to the pressures of gigging despite its low price.