This post will contain all documentation relating to the optical synthesizer project.
The schematic, layout and the whiteboard hardware wiring description are available here.
There is one item missing from the whiteboard list. The black lead coming off the battery snap should go to the "G" terminal on the DC Jack.
I have added some hints on how to make the probe assemblies for those that are not that far along. Same location, "MakeProbesOne" and "MakeProbesTwo".