Try cranking the speed up on the synthesized speech. There are blind listeners that listen to synthesized speech at much higher rates, 600-800 wpm and up. If

Try cranking the speed up on the synthesized speech. There are blind listeners that listen to synthesized speech at much higher rates, 600-800 wpm and up. If you crank up the speed a bit, it would probably help differentiate between normal speech where you have greater expectations on how it should sound, and something that's almost a different language.