About the US FuzzThe US an alteration of the Torn's Peaker circuit to achieve a less overwhelming fuzz sound while maintaining smoothness and power. Great for classic rock high gain fuzz tones, but also capable of achieving a low fidelity, gated fuzz sound. This iteration of the US has a more refined pregain knob instead of the classic texture control, which I find to personally be more useful.What is the 2503 series?It's a way to distinguish this series of guitar pedals begun manufacturing March 2025. Throughout the years I've enjoyed changing up the look and layout of my guitar pedals but I've done a bad job previously keeping track of the various changes. Hopefully this helps collectors better distinguish the various eras of my effects moving forward. Also, as a graphic designer I enjoy creating new looks for my gear.