I managed to configure the Digi+ on Archphile. It works well with MPD, but I need to fix the output frequency for it to work, otherwise the small DAC Audioengine D1 needs to be switched off/on every time I change song, as it goes mute.
I'm expecting this to be a problem of the DAC, not of the Digi+, but I wanted to know if anyone else had the same experience with other DACs and I didn't know about it. Or maybe I have to configure something else; I use the SPDIF input on the DAC.
P.S. I'm really happy with the Digi+ it's what I was looking for