So i stumbled across this rather old thread because i had hopes to do something similar… looked through the source code and found that the current method of google tts is actually not using the voice/tts api at all. It’s rather cleverly using the translate website to read out the text. No limits that way. That being said the current implementation does not allow for voice selection… if we wanted to use voices though on the actual tts api (https://cloud.google.com/text-to-speech/?hl=en_GB), it is free for the first 4m characters for base voices per month and free for the first 1m characters on the advanced voices per month… if someone were to have the time to dedicate to making a new module that utilizes the google tts api rather than the translate site, we could select the exact voice we all want. (“en-GB-Wavenet-B”)
Would need to set up an api key in the config for each instance… worth it?