I use HifiberryOS with my RPI3 and Amp and I'm happy with it.
Sometimes, I'd like to input sound from a device, with a minijack cable and USB-soundcard to play through the amp. That's not possible with Hifiberry OS.
With what could I achieve this? Preferably a headless solution.
I don't know if RuneAudio allows for this, but I would prefer an easier solution if that is possible.