Sorry for tuning into this discussion quite late, but I seem to have a problem that relates to this thread. I've attached some m4a audio files on my Mac, and the files seem to sync fine to my iPhone 3G. However, the file type is not recognised by Evernote. I have no problems playing back mp3 files at all. I am a premium user, and the m4a files are normal stereo 128kbit files, so I can't really see what I am doing wrong here. Is m4a not supported by Evernote on the iPhone?