Ok. I know there have been variations on this thread before, but here's the scenario with a twist: You find yourself stranded on a desert island, and to your astonishment, you have access to an unlimited array of electric guitars and tube amplifiers. Anything you want--any make, model or year--is yours for the asking. But there's one catch. None of the amps will clip. No matter what you do, or how loud you play, everything comes out perfectly clean. You are given the choice of ONE and only ONE overdrive/distortion pedal to use with all this gear until the day you die. What'll it be?