The SD-1 is a good sounding overdrive that is designed in the shadow of the mighty Ibanez Tubescreamer. Underneath the hood of this pedal dwells the potential for a hot rodded overdrive unlike anything you’ve heard. We start by replacing the stock low quality op amp with a low noise TL072 as well as adding metal film caps into the circuit for excellent bass response and a very transparent tone that rivals the big boys. We give you gobs more available gain. We don’t stop there; we add an actual mosfet transistor into the clipping section for the most tube-like breakup and response you will ever hear from a pedal in this price range. This mod also includes the bypass fix so your pedal isn't killing your signal when off.