HTC One M9 User Manual page 326

326 Settings and security
2. Tap Text-to-speech output > Google Text-to-speech Engine, and do one of
the following:
Select a different
language
Install a voice
3. Select the language you want to use.
Not all languages are supported.
Tap Language.
Tap Install voice data, and then tap the language. Tap
next to the voice data you want to install. When
installation is completed, press
Language.
twice and tap