I installed a HiFi Berry DAC on my Raspberry Pi, and added the required lines to /etc/modules. It was easy to get mpd to work by choosing ‘sndrpihifiberry’ in Volumio’s playback menu. But how do I get shairport to use the HiFi Berry too? Currently it’s playing through the Pi built-in output.
Also — is it even possible for two separate processes to share one audio output device using ALSA? From my understanding, that’s a benefit reserved for PulseAudio, which is not included in the Volumio installation to increase performance. But I could be totally wrong.