Yep, I’m realising that :)
I came up also with little information regarding Adafruit’s VS1053 Codec breakout on Raspberry Pi.
Also came across something with the MCP3002 ADC but more problems than successes.
And also VLSI’s VS1103 Modules which are even more interesting (and esoteric).
It’s sad that it is so easy to capture images and so complicated to get a basic analog audio signal system going without getting super complex (and nice!) full solutions like the Pisound Hat (which I have).
The main goal here would be to understand ADC, be able to use simple components, and explore bare bones audio with that nice aesthetic quality of telephony and other primitive audio transmission systems.
This, I gather, is possible with your suggestions but requires more time than what I have at the moment.
Thanks again for your help, Matt. Cheers!