WarpMyMind

Options seem to be very limited! I believe Macs have built in software that does allow some kind of TTS manipulation, but I don't have a Mac. There's Vocaloid, which now has an English version (doesn't work so well as Japanese unfortunately) but apart from those two, not much else that I know of.

It's frustrating, I've searched Google for over an hour looking for software that would allow me to play with TTS voices, but I'm finding nothing of use. I don't need the voices to sing in the true sense of the word, I just want to change the rhythm/tempo.

pump it into auto tune?

I remember that the old SAPI standard for text to speech voices (contemporaneous with Windows 98 and early versions of XP, I think) allowed you to alter tempo and rhythm a bit with text tags, but that's slow and cumbersome.

Vocaloid apparently has some variants (Vocaloid-flex and VOICEROID) that are optimized for speech as opposed to song, but I don't know how English-friendly they are. If they let you alter pronunciation rules, you might get good results.

+If you have Audacity, I would download a Synthesizer Vocoder VST.

A Synth Vocoder, can prolong the wave frequency in vocal patterns.

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