One thing I have to let everyone know about the Google TTS NVDA addon is, don't switch to another synth while you are using the "Google" natural/neural voices. If you restart NVDA, initially use another synth like Tiflotecnia/ Cerence, Flite, OneCore, RHVoice, and you attempt to switch back to Google TTS, it won't speak. The reason why is, Google TTS expects the Chrome OS (HMM-based) voices to be loaded first before you choose any of the natural (neural) ones, and this happens per language, so if you were using US English HMM voices, and than attempt to switch to natural Nigerian English, it won't speak until you select one of the Chrome OS voices. I prefer the Chrome OS ones anyway, so I don't have to deal with it not speaking.