Wait a min. Are you sure the apps convert them? A while ago I used to download as mp3 all the time and whenever I had to import to computer to do some editing like audacity or adobe audition, I found that that the file's core format is not an mp3 but an mp4 renamed as file."mp3". Hence when you open it in computer it might open as video or sound only file but the properties are not mp3.
android recognizes any file with .mp3 as sound. But when you want to modify based on mp3 you can't. And that's why I am saying this doesn't for me trully converts file.
---------- Post added at 02:53 PM ---------- Previous post was at 02:52 PM ----------
Let me try the new version...