I live in Frankfurt, Germany and spent a lot of time testing solutions to feed my digital (USB/optical/coax) Denon PMA-1600NE amp. I have only Windows devices around to control, so there is a lack of useful audio apps. Having a nice web frontend seems the best option and I am very happy with Volumio so far. I tested it with an RPi3 and ordered a Mini86 now.
I am looking forward to interesting discussions and further progress on the project.