What does AAC Version mean
My Song is in MP4 mode I wanted to convert it to MP3 to put it online for sale through my website. The website said the version I have converted to mp3 is not stereo and needs to be. So I came back to Itunes to try and convert it and through this site the option for conversion was AAC, so I did that. Now I am not sure if I messed things up. What does AAC mean? What did I do to my song? And is it now MP3 Stereo?