Add more natural voices

I paid for a yearly subscription with the hope that more voices and customization would be added. However, I can no longer use the service because the current voices are way too monotonous and unexpressive. It's hard to focus on the details, especially when the papers are long. I have tried read aloud features in other systems (such as Microsoft Edge) and I'm sad that the service that I paid for uses less-quality voices than those you can hear for free. Even audioread, has improved their voices in the past year, but Audemic hasn't.