The IBM Watson Services plugin created by @PTP currently allows you to perform Speech to Text and Text to Speech as well as visual recognition using Watson Services.
You can download and install the plugin here https://www.ez-robot.com/EZ-Builder/Plugins/view/251
Before you can use the plugin, you will need to apply for a free 30 day trial of IBM Speech to Text Account here https://www.ibm.com/watson/services/speech-to-text and a free 30 day trial of IBM Text to Speech https://www.ibm.com/watson/services/text-to-speech/
I will create some examples as it moves forward and try to answer any how to questions.
Thanks for creating this PTP, as with all your plugins this is an excellent piece of work and showcase of your talents.