http://www.mp3-box.org/itunes-mp3-cd-aac/
How I can change songs in my iTunes AAC to MP3?
I have my collection of songs, most of the CDs I ripped hard disk, but are in AAC it sounds. Is there any way to change all of them in MP3 format without having to extract all the CD again individually?
There are plenty of utilities that can be downloaded free or purchased to make the conversion. Google search and choose what you like. I believe that profits that cost a little more will work better. But 20 or $ 30 should be the maximum of what needed to happen. You can try using a free tool, but it will be a pain.
How To Import A CD To Itunes As An MP3 File Instead Of AAC