SD and SDHC memory cards are ubiquitous now. My DVD player has a port for such cards (used in video cameras). My computer has a port for such cards (used in my digital cameras). And with digital recorders now using those cards, I’m wondering whether stereo sets have gotten with the program and provide a port for an SD or SDHC card from your digital recorder.
Come to think of it, all one needs is an SD/SDHC “drive” as a separate component that plugs into the stereo preamp or receiver. All the smarts could be in the drive.