i want recommendations for free text to speech interfaces like those used for speech impaired people (screens of icons for quick vocabulary, customizable, with option for full text input)
bonus points for something with a highly customizable voice, or also seeking recommendations for any tts voice that's local, customizable, not genAI, runs on old hardware. i don't want solutions that only work with the system's black box TTS i have to find arcane packs for
please boost! 
yes the idea is to find voices that sound robotic, synthesized
i know that's not what most people using TTS want them to sound like, that's why it's so hard for me to find what i want
yes i already know about dectalk. i know there are many other TTS engines from the 80s and 90s and those all feel like vapourware now because you can't find anything on them anymore
@Kavus i remember trying it some ~10 years ago and it not producing any output (due to my not figuring out how to set it up properly as i seem to remember the documentation at the time being very academic and requiring prior knowledge)
i'll take a look at it again but i'm hoping for raw voice synthesizers rather than something that uses pre-recorded voice databases as a source
@mavica_again
Huh! I didn't know it needed any special setup, I just install it and it goes.
@Kavus i just remember it needing voice files it didn't provide, nor them being easy to being found. MBROLA has gotten a lot more commonplace since the last time i tried it
@mavica_again
Ohhhhh… I think they just come with it now? I can check when I get home.
@mavica_again
Have you tried espeak? That one still sounds fairly synthetic.