Still resisted to make it say dirty things with pitched down voice but will probably break down later in the day and go full blown Tourette!
It uses TTS (text to speech engine) that either comes with your device and if not you can download these separately, there is a lot of them some for free and some sounding better than others- as this app don't generate voices by itself it only manipulates the voice with pitch and/or speed and it makes it really easy to save as Wav. file and can even save each word separately. It is user friendly- Just type in the text in text window use the two sliders for Pitch and/or speed, press rec for the whole text or another button for the separate words.
So if you can't rap, you can now make strange rap songs all day long!
Or whatever automatic speech you need...
It is for free which is as always an extra bonus even though I think that he could charge a euro or something as it is no other app like it.