trayicon NoSound property
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Applies to
acTrayIcon component as subproperty of Win2kInfoBalloon structure.  

property NoSound: Boolean;  

The NoSound property specifies whether the system should utter sound when the balloon hint appears over tray icon. Set this property to True if you don't want a sound when the balloon appears.  

This property works only in Explorer v6.0 and higher (Windows XP+ or Windows 2000 with IE6).