I have some of my music encoded in the AAC format and some in MP3 format. I have a playlist that is mixed with both formats. When I try to burn a playlist on to a disc it gives me a warning saying: "Some of the files can not be burned to an MP3 CD. Do you still want to burn the remainder of this playlist?" My question is there some way to burn a playlist that is mixed with different formats AAC and MP3? I check my preferences and in the advanced, burning section I have selected disc format --> MP3 CD.