janneschimmel, are you using a wav file or making a soundcue after importing the wav file? You said the sound only plays once, which makes me think it is supposed to be a looping sound, but maybe you didn’t set the sound to loop? You can set the looping flag in either the wav or the cue. If you are using a soundcue, it doesn’t matter if you have it set to looping in the wav. It needs to be set in the cue.
Also, concurrency is used to limit how many instances of a sound play at once (for instance, if you have ambient sounds that are overlapping and you want to limit it only to the 3 loudest, you would make a concurrency preset and assign it a value of 1 with a resolution of Stop Quietest, and then assign that to all the sounds you want to obey that rule. Concurrency can be set on the wav or the soundcue (depending on which you are using).
If you are still having trouble, please include screenshots so I can see the problem.
Finally… 200 radius with 400 falloff is very small and means your sound will only be heard for a total of about 20 feet.
