I figured it out. To get any sound that you like as your text notification sound l have done the following. Record your sound using 'voice recorder', this will end up in the files > sd/sounds section. Open the sd/sound, you should see the recording voice 001, at the bottom of the screen press the lefthand key this brings up a menu with 9 options, option 6 is move, press this. sd/sounds file returns, press the tick box and press move, this brings up all files, scroll down to notifications, press that and then 'move here'
Your recorded sound will now be in the text notification file. Open settings, then sounds, then down to default notifications, this will bring up all the sounds including you new sound.
Hope this help someone.
durriti