To add sound to a panoramic view, all you need to do is to give the same name to an ".mp3", ".wma" or ".wav" file and put it in the same folder as the exe file.
To use the same sound file by more than one panoramic view, use a word or a word group that is common to all exe files. E.g. to hear the azan from the minarets, use a file named "Minare.wma".
If you want the sound to loop, add an extra "_R" to the name. E.g. "Minare_R.wma".
Why are the screensavers silent ?
A screensaver might come up unexpectedly and distract people. This is why sound is turned off in screensaver mode.