I've successfully installed RuneAudio+R e6 on my Pi 3 and it seems to be working just fine. Still need to play with the interface to figure out how everything works, but at least it's running and successfully compiled my 28,000 song library from an external SSD drive. However, I can't figure out where in the settings or config files to tell the program I've got an InnoMaker RPI-HiF-DAC installed on the Pi. I'm afraid I know enough Linux to break things on the Pi, and I'd rather ask the experts than mess up what I have so far. In other words, if there's some code to add to the config.txt to recognize the InnoMaker card, I have no idea what it is. I've looked on InnoMaker's website and it SAYS the card supports RuneAudio, but they give set-up examples for Volumio and others... note RuneAudio.
Hopefully, someone can help. Thanks very much.