http://vfepedals.com/triumvirate.html
Head over to the VFE website to learn about the circuit. Click on different parts of the block diagram and the actual pedal image for lots of good info.
This thing is essentially a giant, super tweakable, 3 band EQ. EQ consists of different ways of using a "filter". Learning about filters is a cornerstone of audio signal processing. My suggestion is to learn about how to make a HPF "High Pass Filter" and a LPF "Low Pass Filter" usig a RC "Resistor/Capacitor" circuit. From their I'd move on to learning about the differences in "Series" and "Parallel" signal chains.
Sorry, I know that's a non-answer.
It was a good answer actually, gives me places to research and new things to learn.
Took the pedal over to my friends and he spent a good 45 minutes playing while i tweaked the knobs, he's more a rack guy and thought this pedal was killer, better even.
It definitely has a massive range for tones, we stumbled across a really nice 70's fuzz and a blues sounding tone within a few minutes.