I'm using XLD (free) on my MacMini for ripping. I set output to ALAC, but you can pick any format. I set output to Itunes directory and it creates automatically subdirectories with music. I also set number of attempts to 200 to be sure I will get bit-perfect rip, even on badly scratched CDs. I use Itunes (now called Music), but I created Smart Playlist for each genre. With playlists it shows all thumbnails on one page - much nicer than scrolling.
Check what was that Itunes created (get info). Perhaps it was ALAC and not AAC (both have the same .m4a extension). If that is the case you can easily batch convert all of them to AIFF using XLD. It cannot be done for AAC, since it is lossy format.
Check what was that Itunes created (get info). Perhaps it was ALAC and not AAC (both have the same .m4a extension). If that is the case you can easily batch convert all of them to AIFF using XLD. It cannot be done for AAC, since it is lossy format.