There's a pretty advanced Mac OS speech markup language, I wrote about it here: https://www.mattmontag.com/personal/mac-os-x-speech-synthesis-markup https://www

There's a pretty advanced Mac OS speech markup language, I wrote about it here: https://www.mattmontag.com/personal/mac-os-x-speech-synthesis-markup https://www.mattmontag.com/personal/mac-os-x-speech-synthesi... Going back further, there was also a prosody markup for Sound Blaster speech synthesis (Dr. Sbaitso, anyone?).