"unsupported format" when adding .MP3 in Toast 17 Posted April 4 · Report reply Hermie, if all James has available at some location to play music is an Audio CD player, then that's a perfectly valid reason to make an Audio CD. Agreed, you don't "get anything back" from the compression, but if that's the format he needs/wants, I say, "write away." I still have a vehicle that has an Audio CD player. It doesn't play MP3 discs. At home, I also have an Audio CD changer. Again, it doesn't support data/MP3 discs. (But since it holds 300 CDs...) So, just like printed photos, it's a valid media.