I use some spare DSP33s with an old 518/562 combo as mixer/switch in a desktop system in my holiday home. (The 518 is the one Steve (syles) has a build thread on here where he converted it to accept a USB input.)

I’d imagine that a 562 on its own would work in the OP’s use case giving line in AD conversion as well as a variety of digital inputs feeding into a single digital line out to the speakers. It is high enough resolution for my rather basic recording to FLAC (vinyl to digital transcription) and work environment playback needs.

Peter

808.3, Melco N100 EX, Control:15, DSP5200.2
210, 218, AC12, MC200, Innuos Zen and Zen Mini, DSP7000
Oppo BDP 95, Lumin D1 AC 200, DSP3200
Apple TV, Matrix Audio x 2 DDC, DSP33
Chromecast Audio, DSP33