To be clear, it'a probably Debian underneath the VolumioOS: They offer good web and mobile integration, including album art and searches, with a responsive UI.

To be clear, it'a probably Debian underneath the VolumioOS: They offer good web and mobile integration, including album art and searches, with a responsive UI. Doing that by hand or CLI might be a challenge, but certainly not impossible. Considering you can install and run VolumioOS for free (avoiding all subscription/upgrades) solves most of the 'network' and 'audio' part of your player, gratis. You can use the default headphone audio output on the Raspi - my solution might be overkill. Yes, I have dumb speakers attached to a dumb amplifier which has one input for the Raspi's RCA outputs. (I do modify the stereo output to mono however)