A quick note about the power. In the schematic it states that the voltage is +9VAC, not +9VDC, but if you read through the thread himister states that he used +9VDC to test it and the pedal worked fine and correctly, which is why I put the voltage as +9VDC.
Modded with symmetrical clipping diodes to provide some more distortion, and a gain pot that controls how much the diodes are in the circuit, similar to the Germanium Giant, as well as a basic tone control.
Same layouts as above with the change to the power section. I decided to not include an onboard charge pump as it's just as easy to add one offboard with the available charge pump layouts on the site.
Modded Layout with Asymmetrical Diodes: