Here’s my take on the muff. It’s basically a Green Russian with larger 560pF caps and KT3102E transistors around 500 hFE. I added the high pass filter and Bender mods, and added a mid-scoop control pot. Fortunately, I have some Ukrainian friends who helped me label the entire pedal in Russian. Etched with FeCl. It even has the Russian OTK stamp on the bottom. ?

Special thanks to Cybercow for helping me to troubleshoot it!