Finally finished mine after sourcing all the parts here in Japan. Cd4046 was the hardest to find from the chips. Still have the wrong switch for the dpdt, but it works in two modes for now. Only setback I had was the Tl072 wasn't connected enough. It was working one minute but not the next. Took hours to track down. I guess I was too careful with the chips. I added a volume knob on he side because I felt it needs it. Some clock noise ticking, but only really when I'm not playing. Doesn't bother me. Cool but challenging build. Glad it turned out