Share a ground with the #PCM5102A chip. Audio channel to resistor to ADC. Easy.
Still going to tweak a few things before I figure out where to situate it on the case.
Also need to figure out the keyboard connector ... cuz I wanna have that ... out.
Stereo audio out [3.5mm, am not using the 8-pin din for that].
Should I do more pixels for this? Maybe like the entire area between the logo and the power button? <w<
Ahhhhh the sense of accomplishment when you get a mod working is sooooo goood >////<
I only had to solder like 7 things for this lmao - the #PCM5102A DAC was [partially] prebuilt, and the #SKPico A5 to CPU pin 12 was a breeze.
The real challenge was cycling through firmware builds & versions until I landed on something that worked...! 
Guido Lehwalder
jojess