I asked this before, but didn't find an answer (https://support.hifiberry.com/hc/en-us/community/posts/360015523557-Which-OS-distro-to-use-Raspberry-Pi-3-HifiBerry-Amp-to-allow-for-audio-in-)
How can I use my Rpi3 + AMP to play analogue audio (from a phono with pre-amplifier or from a Teenage Engineering PO)?
I don't think I can do it with Hifiberry OS, Volumio, RuneAudio, Kodi, ..
MAYBE it's possible with Max2Play, but I didn't find real confirmation (and I don't like Max2Play because it's ugly :-) ).
Probably with just Raspberry Pi OS, but to do that headless is maybe not that easy.
The input would come from a USB-DAC, but if Hifiberry sells a card that can help me with this, I would be happy to buy one.