Demo by BassTheWorld

Demo by Buddy Blues

Designed to work with most basses, from clean to medium-heavy distortion. 
the circuit is based on a CMOS inverter chip, like the ones found in the Way Huge Red LLama (R). I've been building pedals based on this chip and love the touch sensitivity and the slightly fuzzy character of the drive.
The signal is split at the input, one side is distorted and the other one is a fully-transparent clean path. Both signals are then mixed toward the end of the circuit, right before the TREBLE control. I've decided to not include a BLEND pot, as I often find there is only a small sweet spot where I like the sound, so I chose a blend percentage where you mostly feel the added clean signal, adding weight to the driven tone while still mostly hearing the overdrive circuit.

This is Version 2 of the circuit, with several refinements

Proto Type MKII