I can't really answer your question about the Sega CD audio, but I do know that the very first Genesis model is the one with the best sound, along with being able to play overseas and unlicensed games. It has this FCC number on the bottom:
I can't really answer your question about the Sega CD audio, but I do know that the very first Genesis model is the one with the best sound, along with being able to play overseas and unlicensed games. It has this FCC number on the bottom: