Because of this incompatibility issues, you will frequently encounter situations where you need to convert M4A to MP3. It is mainly used by Apple iTunes for downloaded music files. Although the M4A format was meant as a successor to the MP3 format, it is not widely used and, therefore, not supported by a variety of audio players.(Album iTunes Plus AAC M4A) Lucitunes II noviem℗ 2013 Magenta. Página Principal iTunes Plus Grupo Play.See if you can find two tracks you uploaded from CDs, one which does and one which does not play in the Soundtouch application library. For example, ensure that each song has a track, title and artist name, and check for any non-standard characters in the song information.