New comment by joey-commits on void-packages repository

https://github.com/void-linux/void-packages/pull/27193#issuecomment-748299028

Comment:
You can test espeak-ng by typing:

espeak-ng "testing testing"

 which will play speech through your sound card.

Alternatively:

espeak-ng "testing testing" -w output.wav

will generate a PCM audio file with the speech.