The Lovepedal Roadhouse Eternity Overdrive is actually a clean boost, an OD/Distortion pedal and a Treble Booster all in one small box. You create your tones by blending elements of all three, and the results are amazing. The Treble Boost replaces a normal tone control so instead of finding the spot that's not too fizzy or not too dull like on a normal stomper, you simply dial in the treble boost that gives you a more dynamic and responsive top end.
The actual design of the circuit is quite simple, but that simplicity translates into an incredible tone. It sounds and feels like an overdriven amp.