A more versatile Overdrive pedal

There are lots of overdrive pedals in the world, but most of them follow the same formula, operational amplifier circuit with negative feedback, 3 knobs that control gain, volume and tone, one type of clipping style, no bass ajustment and sometimes without true bypass.

This is my version, and its based on famous green box. Has selectable bass, 9v to 18v operation and more distortion.

Inside we find the diode clipping selectors.