[Art]

In the early days of Speech Synthesis, the Bell Labs created the Voder, a hardware-based Speech Synthesizer. It was operated/controlled by a human.
Notice the part around 5:40 when asked about the future of the device.
It was sort of like saying No, we'll never need telephones or TV's or computers or smartphones...or...

Very cool for the time period. This device was part of our technological history, so be kind in your judgment. 

[Freddy]

This is very cool. I have seen (or heard) it before, there is video footage of this demonstration but it was years back when I last saw it.

With regard to current speech tech,  inflections have some way to go even now - amazing they did it so well back then 

I never heard modern voices impersonate a cow either