[dale_glass]

Is there any TTS engine that doesn't need cloning and has some sort of parameters one can specify?

Like what if I want to graft on TTS to an existing text chat system and give each person an unique, randomly generated voice? Or want to try to get something that's not quite human, like some sort of alien or monster?

[unleaded]

You could use an old-school formant synthesizer that lets you tune the parameters, like espeak or dectalk. espeak apparently has a klatt mode which might sound better than the default but i haven't tried it.

[bkitano19]

You can use voice prompting; it's supported on ElevenLabs and Hume.