The NOVA chat communication aids are based on Android tablets and use the Chat software from Saltillo. A range of text and symbol based vocabularies are available including for example WordPower and MultiChat.
Once you have downloaded the voice you want from the Google Play Store, go to 'Settings' on your device. You need the Text-to-speech output which can be found in different places depending on which version of Android is on your NOVA chat.
For example, if you have:
Select the CereProc voice that you have downloaded and then adjust the Speech rate (and pitch, if this is available) to your liking.
Now open the NOVA chat app and go to:
That's it!