J Rockett The Dude Overdrive Pedal If you want the Dumble sound without shelling out tens of thousands of dollars, check out the J. Rockett The Dude overdrive. Designed to emulate the iconic Dumble Overdrive Special amp, The Dude functions both as a clean boost and as a creamy overdrive pedal with the full range of the original amp. The Dude has four simple knobs with which you can dial in your ideal drive: Treble, Level, Deep, and Ratio. Control the ratio of gain to boost, scoop or enhance your midrange frequencies, or precision shape your treble and bass to get that Dumble sound with J. Rockett's The Dude Overdrive.