Thank you very much ! @BenTalagan @valdisvi

Hebrew is added in espeak-ng very recently on development version only. To use it, either build it yourself from the source code, or use on-line version.

Hi, this may be an installation path problem for espeak's data files. Have you installed espeak-ng from sources with make && make install ? If so you should have support for hebrew. You should check this with the command :

espeak-ng --voices
````

Hebrew should be in the list. What's the output of this command on your machines?

Also, the command : 

espeak-ng --version

will give you that kind of output :

eSpeak NG text-to-speech: 1.51-dev Data at: /usr/local/share/espeak-ng-data ```

This should give you some info about your installation and you can check if files are present in that directory.

Ben