.Map :: MoHAA Mapping

I try to use a radio with some music in my map but it doesn't work.
For the music i use a Sound/speaker with those enitys:
Key:targetname
Value:mus_berlin.mp3

In the script file i apply this:
mus_berlin.mp3 loopsound "sound/music/mus_berlin.mp3"

Use a script_model with model fx/dummy.tik instead of the speaker.