The Shipwreck Overdrive is designed to emulate the cascading gain stages of a tube amp, with discreet controls over two gain stages, output volume, and high-end tone shaping. Use PREGAIN to overdrive the first stage. Use GAIN to control how much of that signal pummels the next one. This extremely versatile overdrive can go from clean chime to thick rich distortion. The characteristics are infinitely variable with the interactivity of the two gain knobs. The Shipwreck also cleans up nicely with your guitar's volume knob - leave the Shipwreck cranked and adjust your gain right from your guitar. The TREBLE knob shapes the tone of the pedal for bright aggressive bark or warm smooth overdrive.