Sources are mono or stereo analog sources (LPs, 78s, 45s, cassettes.) I have a TiBook 550 - but that's where the Opcode SonicPort comes in - it's the USB A/D/A converter. There's some support built in to OS X, but I've discovered that the Apple supplied drivers don't work as well with it as do the USB ASIO drivers. I'd welcome recommendations on audio recording software for OS X. JEL