Cornerstone Sparkle Overdrive is a super touch sensitive overdrive that  reacts very well to your playing style. This Sparkle is an extremely easy to use and versatile overdrive.
Looking at the controls, there are Volume, Gain, Bass and Treble. The Volume control acts as a master output level control. The Bass and Treble controls manage the frequency responses of the pedal. With both set at noon, the Sparkle creates a flat frequency response, When adjusting the tone controls, the sound always stays full and well-defined without ever getting muddy or gloomy.
The 9V/18V switch allows the guitarist to choose which voltage the internal circuit uses, still using the same external 9V power supply. In 18V mode, the pedal offers a lot more headroom than in the standard 9V mode. Extremely useful for guitars with more powerful pickups.
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