Convert Multiple MP3 Files To M4A Files Software - Version 7.0 This software offers a solution for users who want to convert one or more MP3 audio files into the M4A format used by iTunes. The user chooses the file/s or an entire folder to be processed before starting the conversion. Next, click the 'Start' button to begin the conversion. With this software, users will be able to quickly organize their song collection in a way that is fully compatible with iTunes.