PROFESSOR BOOGIE

Your Professor Boogie is a full flavoured high gain distortion pedal. The circuit is an emulation of an amplifier head (for legal reasons you'll have to guess which one). The trickery at play here is that the valve stages of the actual amplifier have been replaced with a solid-state counterpart, the JFET. These semiconductors behave much like tubes and need to be individually biased and tuned as such.