As you may have noticed, amarok acts a frontend for various media players. You can choose between xine, arts and helix/realplayer. This means that apart from the amarok package you will need an interface to the backend, called amarok-xine or amarok-arts or amarok-helix, respecively
and a working (mp3 playing) backend (xine/arts/realplayer). I got good results with xine. For arts and helix it was a little more tricky to find working packages. If you are using xine, use the packman packages, for helix you need to point amarok to the realplayer installation (not helix, as it doesn't play mp3).
EDIT: This is an older thread with a similar problem. Have a look!
http://www.linuxquestions.org/questi...d.php?t=406323