I looked at Volumio on a 4GB Raspberry without a DAC attachment. I connected Volumio to my Denon AVR via HDMI and was able to play my music from the NAS just fine. What many don't know, almost all AVRs basically process all input signals digitally with their own built in DAC because of room adjustment and loudness, etc. An external DAC only makes sense if the analog input is "looped through" from the receiver. I then got the Volumio test account to try out Tidal Connect - that also worked - but that's not how I wanted to control and manage my local and streamed music - I want to have all my music in one application - unfortunately Volumio can't do that. I then got the solution from the company Teufel with the app Raumfeld to try out. This solution can do everything I was looking for. Just great - that's exactly what I would have expected from Volumio. I have therefore terminated my subscription with Volumio - I think Volumio still has a long way to go - good luck.