Text2Speech is an application, developed by iPhonix and recently added to Cydia, that allows us to write a text to be reproduced in the form of audio through our iPhone.
This application is useful for the day after we go to the amusement park and spend the whole day shouting (some will tell me hehe), although the main downside I see is that it is not in Spanish, although I suppose (unless already exists and I have not seen it) at some point they will implement a language module to update the application
What I can say is that the application has a good, although improvable, graphical interface and that it is possible to export the files in * .wav format, as you can see in the video that accompanies the entry.