For those like me living in linux, there is espeak

I've heard it's Stephen Hawking voice --cant confirm-- but sounds really really similar.

http://man.cx/espeak

EDIT: Thanks lucb1e! I do also use espeak, the other gave me same weird error.

All I can find about the other one is this project: https://github.com/williamh/espeakup

Never heard of espeakup, I use espeak. In fact, apt-getting espeakup I get some error when running it whereas espeak seems to work out of the box:

    $ echo test | espeak # works
    $ echo test | espeakup # Unable to open the softsynth device

Does your espeak version not allow "espeak <words>" ? I don't totally understand the need or use of piping here when not necessary, and when it requires additional keystrokes.

Now try it with -v cello