Crystal-clear and transparent overdrive. The product of years of tireless research in pursuit of the true vintage overdrive pedal tone, Dr. J brings you the Green Crystal Overdrive. This compact pedal delivers the characteristic overdrive tone of tube amplifiers: clear, transparent, warm and natural with a dynamic feel without the compression. High and Low frequency knobs, 3 options for diode clipping, and great adjustable tone range. You'll love the broad and natural range of frequency response. True Bypass design minimizes tone loss.