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This is an exact Tonebender MK1.5 pedal topology, but with a few part values tweaked a bit for better performance. Analogman made the BIAS resistor adjustable on the BIAS knob in the center of the pedal, as there are some great sounds to be had by running higher bias than normal. It gets brighter and cuts through better when it's overbiased. Some people like the bias lower for a deeper but softer sound. There is also a blue BIAS trimpot inside to set the center setting of the BIAS knob. Analogman set it at 5V at the shop and normally you should not need to use that. But at high or low temperatures it can come in handy if the bias changes.
Analogman also changed a capacitor value slightly to make it sound and work better. In addition, they added the CLEAN trimpot like their Sun Face, as it helps preset the pedal for cleaner, or less bassy tones that some people like, especially with hotter pickups. Analogman recently changed a resistor value slightly to make them a bit louder. Simply copying a schematic would have been easier, but Analogman wanted to make the pedal as great sounding as possible, and allow it to work with various guitars and amps.