have started to download tracks as .m4a files recently rather than MP3 - in fact some sites only give me the .m4a option. all is good normally, but with downloads from one site in particular i can not see, delete or modify the tags with MP3Tag. with these tracks the only app that allows me to edit the tags is iTunes (which i don't wish to use). anyone got any ideas why this is - are there different standards for AAC files??? and is there anything i can use to get rid of the existing tags and use MP3Tag instead?