Chat is an essential part of the Twitch experience. It allows you to interact not only with fellow members of the community, but with the streamers as well.
Additional features: Customizable to mute specific users' messages; Keyword filter on text-to-speech; Configurable voice pitch, rate and volume; And more.
Check out https://www.speechchat.com/ it might be what you want. It allows you to set all messages that come through chat to play over tts and it's all free ...
