By using TTS already installed in smartphone, you can convert text to voice, play it, and save or share it to other people through SNS.  It is easy to use even for adults because it is very simple to use. Please try it when there is fun of the sound of the machine or when it is hard to say. I hope you have a useful person ~ [Application - Change the voice of a man, change the speed]   It may not be supported by each mobile phone model. Please try to follow slowly. *** Before Android 6.0   1) C