here is my little project.
Volumio 3 running on Raspberry CM4 (2Gb RAM). All is powered via POE
Audio card: HiFiBerry Digi2 Pro - Coax RCA out to the DAC
Display: Waveshare 11.9" HDMI with touch
Button: RGB Push button
I’ve made a little python script to control led color based on sample rate, add play/pause and shutdown to the button.