Hi Den, Nah you should be able to just pick an Mp3 from within the app and it should work. I've found that it can be a bit picky in terms of what will actually play back and the current version has almost no feedback to indicate what works and doesn't, so what I recommend is to select a sound, set the alarm for like two minutes in the future, and see if the sound plays; if it does, then you know you're good; if not, try another Mp3. (You choose a sound by pressing where it says "Sound" in the alarm settings screen; sounds are set per alarm, so make sure you choose your sound file for each alarm that you setup). Also make sure the volume on the tablet isn't too low. When the alarm starts the sound will be very quiet, and get louder as it continues to play, so if you have a very short sound it probably won't work as you expect.