OK i didn't want to start a new thread so i'm just gonna ask it here. I was getting worried that perhaps it is possible some of my "flac" files were mp3 to begin with. so I tried converting an mp3 file to ALAC and it works. the file was identified as apple lossless and the file size was almost the same as the proper alac file. question is. how do you tell if the files you've got were once mp3 and then converted to flac?