Hm...I have tried playing around more with this new TomTom Go app and there is another issue with the voices. I can only select one of the English Text To Speech voices. None of the recorded voices will stay selected. It doesn't matter if it is one of the english recorded voices or a foreign language recorded voice, none will work. They preview just fine in the download voice section, but once downloaded, they do not preview properly and even if you select one, the system will not keep it selected once you hit the back button to go back to the map. The system will only keep a TTS voice selected.
(regarding the tts voices, it seems they must match your device language. another forum thread stated this)
Does anyone know what is going on? Is this a bug? I have the latest version (1.13.2) installed.