That’s a marvelous idea to try to set the mime type as it should be 
However I think the correct mime type is audio/mpeg. With audio/mp3 it doesn’t seem to work. I’m trying audio/mpeg right now, with “object.item.audioItem.musicTrack” as the class (although maybe another class would be more appropriate but I couldn’t find the possible classes anywhere). I’ll post the restults when I can…
Thanks
