Updated the pcb design files. Now master branch is master-wm8978 using the wm8978 codec.

WM8978 ADC is MUCH BETTER than the WM8731:
Read this also: https://hackaday.io/project/7936-cortex-guitar-board/log/44553-this-adc-makes-weird-noises
It strikes me that it is still used so often in Eurorack audio (I made that mistake too)...