Thank you so much for this dannymur. I have spent DAYS trying to get away from the rubbish/quiet default notification tones! I had given up hope of ever knowing when I had received a text again (or at least for the length of this contract)! I doubted all the while I was creating new folders and moving files to your instructions (me of little faith) but did you hear my SCREAM when it worked.
I have also downloaded the file manager you suggested. Thank you thank you thank you