The Groundswell full overdrive with a natural response to picking intensity. It features two transistor based gain stages, so it doesn't have that artificial over-clipped sound like many "overdrive pedals" out there. No compression, just gain and drive! Dual gain stages and a voltage reducer that alters total amount of gain, as well as feel and response to pick attack.
I originally built the Groundswell for myself, my goal being a unique overdrive with a natural feel and sound. After getting a lot of requests to build more, I decided to make it available in small quantities. Users' reactions have been really exciting!
As an idea for a mod it may be worth adding a diode clipping switch to this to give you more dirt options. Using a 3 position on/off/on with a lug layout like this:
Take a feed from Volume 3 to lug 2
Lug 5 to ground
Solder your favoured diode pairs between lugs 1 & 4, and 3 & 6. I suggest 2 top to tail 1N4148s or maybe 1N4001s one side and maybe a couple of LEDs or germanium diodes at the other. The middle position will then be the diode life stock pedal mode.