MCX8000 .m4a files and engine prime

Hi all

First of all I want you to see that my problem is with .m4a files encoded as acc to 44100 and 320 vbr that according to the manul is a supported format, in no time I speak of mp3 that I also have them to 44100 320 vbr and they work perfect, or is the problem are the m4a with codec acc in engine prime directly without analyzing in the controller work perfect but obviously without seeing the points and others that already had, sorry my english

regards