We've built our own text-to-speech system with an initial English language model we trained ourselves with fully open source data. It will be added to our App Store soon and then included in GrapheneOS as a default enabled TTS backend once some more improvements are made to it.
@GrapheneOS I'm interested in having working open-source #TTS for Slovak language in the future. I my-self am not proficient enough to create my own high quality engine but I think I still might be helpfull. During all these years I've been contributing to eSpeak-ng slovak language support and recently with friends @ondrosik and @asael we are contributing to #RHVoice.
Thus I will be watching the development of your TTS engine to find out if it can be trained using a homelab setup and if adding support for the language is something I might be able to help with.
Thank you for this news and all the hard work you've put into it.