Hey von Kinderei.
Sometimes FC can be a bit like that, but you can be fix it.
Go to the option screen uncheck all the sound setting, and click accept and exit the game. Then re-start the game check the sound setting you would like on, and click accept and the sound should work.
If you still have the same issue edit the Fleet Command.ini file
[Sound]
.DisableSoundSupport Yes to No
.DisableSounds Yes to No
.SoundVolume 65
.DisableMusic Yes to No
.MusicVolume 65
.DisableVoice Yes to No
.VoiceVolume 65
.DisableAmbient Yes to No
.AmbientVolume 65
.DisableRoomBG Yes to No
.Disable3DSound Yes
save the file and load the game.
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