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Yep it's that :

[code=csharp]public static int PlaySound(string sSoundFile, bool bSynchronous, bool bIgnoreErrors,

                                bool bNoDefault, bool bLoop, bool bNoStop)

    {

      if (!enableGuiSounds)

        return 0;[/code]

If enableGuiSounds is false (not enable) the sound is not played at all and then lead to the original issue lol