Thank Bertus. Yes, I see there are a few files with theremin schematics and explanations. I have a growing list of potential projects that I'm not sure I'll ever get to lol. But great to have choices.
I think my next venture, is to try to use everything I learned about pedal building, and try for a final build. This is because I have now received three steel professional looking pedal boxes, that come with a PCB, a step drill bit and templates. But before I =do that> I plan to breadboard the stomp box switch. I have never used the 9 pin switch that is found on cost all boxes, and so I plan to wire that on a breadboard first, along with a LED. I may need help figuring out what step down resistor I need for a blue LED. I know most boxes use red LEDs, but I think a blue one would look sharp- especially since the case are silver.