Itunes-m4a-download-blog -

Select a song in your library, then go to File > Convert > Create AAC Version . Quick Tips for M4A Files

Once your settings are correct, you can download your library: itunes-m4a-download-blog

Go to Edit > Preferences > General > Import Settings . Choose Encoder: Set "Import Using" to AAC Encoder . Select a song in your library, then go