This is odd and started recently. I am at a loss to find the answer. When I receive a SMS my chosen tone is played but then another one plays until I open the SMS or pull down the notification bar. I have checked in System settings and my choice for phone and notification tones are there. I have looked in SMS and my selection for SMS tone is there. The other tone that is playing is none of these. I have LauncherPro and can find no notification tone selector in the preferences of that. I also have Executive assistant and similarly can find no tone selector in it's settings. Does anyone have any idea were this tone may be coming from?