converting mp3 to cda

Ruben,

CDA is not an audio format. CDA is just for the tiny index files, one per track on an audio CD.

If you wish to burn your MP3s to an audio CD, put the songs in a playlist and use the command File > Burn Playlist to Disc. You can consult the details in this document:

http://www.amazon.com/gp/feature.html?ie=UTF8&docId=1000464931

Sorry, I pasted the wrong link. Use this for burning:

http://support.apple.com/kb/PH12271