From DCW:
The ZAZ Drive has all the smooth overdrive tones that you've been looking for. It's a great pedal for light to medium gain rhythm and excels at lead tones with a singing vocal quality to the mid range frequencies. The Tone and Voice controls work interactively, offering a wide range of sculpting. The Voice knob allows you to dial in the gain placement and low end response to match whatever amp or guitar you may be using. The ZAZ Drive provides a smooth overdrive sound that does a great job at retaining your picking dynamics. A must have for lead players.