A new page, Writing for TTS, gives details of ways for you to make text easier for listening with Text to Speech software.
It starts with a 10-point list published in B.D.A. Dyslexia Contact magazine, September 2013.
Then there is a long account of details, reasons and samples for you to try with your own TTS, in HTML format, with links to identical Word and PDF versions, because the voices operate slightly differently in these formats.
And finally, there is a summary of all the items as briefly as possible.