iOS7's default Text Tone is called "Note". I like it, but need it to "ring" twice to help ensure I hear it & know I have a text message. How can I create an overlay of the "Note" sound twice, basically creating the "ding, ding" that's in the Classics Sounds called "Glass"??? (I don't want to use the old "Glass" sound because way too many people use it. Or who can do this for me in a professional manner?