Analog audio input source

Hi,

Could be possibile to add an analog audio source as ADC Hifiberry or an USB audio card?

My objective is connect a raspberry to my amplifier (with cd source) and stream the music to another room.

cd -> amplifier -> Musicbox ->>>(multiroom)>>> other Musicbox -> speakers

Possible yes, but you’d need a mechanism to switch between your analog input and the rest of musicbox. I don’t have any any plans to integrate something like that, it’s quite niche.