Sorry for my late response. Thank you for all of your patience while waiting for a reply. I just wanted to make sure that your issue is addressed. I can definitely understand how frustrating your situation must be. I would love to help you find a solution to this issue. As @Rubes stated, at this time there is not an option to change the notification sound for your camera.
Please let me know if you need further assistance.
I just wanted to jump in real fast to see if you saw Brad's reply and to see if you still needed some help on this or if you were able to get it sorted out. If you are still needing some help, just let us know and we'll be happy to continue helping.