Hi DVO, thanks for your reply. Sorry, I meant 24-bit/192kHz, which is the highest quality that (some) of Apple Music tracks are coded in. I do have a Volumio Superstar abo, but I was just wondering if the iPhone +USB/Lightning dongle connected via USB to the Pi/DAC would show up in Volumio just like an external sound card (I tried an older Griffin iMic USB, which is indeed correctly recognised by Volumio as a sound card, but it is quite old does not seem to support high bitrates). I don’t have a Dragonfly lying around (they seem quite nice though, but like you say quite expensive too). In my opinion, a Pi+DAC-hat could qualify as an ‘external DAC’, as described by Apple–but there their support stops. It seems that the company is not really interested in HiRes, and even does not provide proper support of it. They seem much more concerned with hyping the Dolby Atmos format, which locks users even further in their ecosystem.