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You're very welcome, Greg. Glad it worked out for you. For my 2nd PCB, I've decided to have JLCPCB populate all of the SMDs on the bottom side of the PCB. Then, I'll hand solder the larger through hole stuff (DB25, trim pots, T4 headers, etc) on the other. By adding a Cu shim, the CODEC IC can be...

I would assume it is just an analog signal, you might want to take a look at the old OpenLase project by Hector Martin. That should give you some inspiration and technical insight.

Regarding Toccata & Fugue, the real video is available here: https://www.youtube.com/watch?v=dgqoiAIAPXA This version is so much better than my first guess at it, with lots going on to not leave out. Regarding ports printed backwards: A perfect solution I never would have seen. Thank you Roj....

You are right. But the nerd in me likes to play with stuff like this. The only thing I cannot figure out is the “figure signal”. Seems like it is a simple 0-1V signal maybe.