CATALINBREAD EPOCH BIAS preampWith this new version, Catalinbread added a Bias control which gives you a little more gain and body from the stock circuit by simulating out of spec parts in the preamp core. They played with the early" and "later" circuits and found the differences to be a bit too subtle, so they decided to add a well curated filter knob to take you from early to later and beyond, a tasteful hi cut that lets you adapt the pedal to your rig. The Preamp control lets