you need a changer with a digital i/f for it to rip CDs prbably in real time

It does not rip. According to the PDF datasheet, it That web page says it "captures analog audio signals, stores them in ... digital format, and plays them back on demand." So, of course, it's real-time only. And although it says the music database is searchable by title, genre, etc., it doesn't say how the titles and genres get there for tracks recorded in analogue ("does not require a PC", yeah right).

It's an interesting hack but is not to be confused with doing it properly.

Peter