Albert, the "S" is only an descriptive icon on the enhancements page. You need to go to the scenery download area and if there is an "S" for that scenery, click on it and the folder with sound effects will download. Be sure to look at the NOTAMs page for news on scenery that has the sound enhancement. Hope this helps, if I misunderstood your post and you are doing this, maybe the link for that sound is being updated.