paul- wrote: 
>  and anolog pot is really not much use over an encoder.
Basically you are right, of course. But my idea was to have my headless
little streaming Pi connected to my fabulous Wega Concept 51k
controlling everything related to playback on my Denon AVR (vial
Airplay). An a "nice to have" feature would be to have a volume control
that actaually shows the state of the player's volume setting when
powering the PCP-Pi.

> To do it, you would read analog voltage and use software to monitor
> "step" changes in voltage, then send the command to increase or decrease
> volume.
Exactly. I believe that's what they did in the project I'd linked to.
But thinking this twice, my project would be even more complicated. I
realized that I would need one of those motorized linear Alps/Alpine
sliders that were (still are?) used in highend sound mixers. See
https://www.adafruit.com/product/5466
So the idea is:
After powering up the Zero W, it uses the volume status of a determind
player, converts it to volatge and send the slider to the correct
position.
When moving the slider manually, voltage difference ist converted to a
volume setting in LMS.



PCP (always latest version) on RasPi 3 with PhatDac (player & server)
PCP on several RasPis 2 +3
2 Airplay speakers (Sony SA-NS510) integrated via Airplay Bridge Plugin
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