Volume controls output and can be used as a clean boost, Attack regulates how quickly the compressor reacts, and the Compression knob allows easy control of dynamic range. The Automatic Gain Compensation feature compensates for input gain loss; the pedal can automatically increase compression ratio as the signal approaches threshold, allowing it to function more like a limiter. The pedal is wired true-bypass and assembled in California. Visit http://www.SeymourDuncan.com.