"Every breath and sibilance (S sounds) sounds robotic." Solution: Enable the "Breath Control" slider (bottom right). Slide it to 70%. This stops the plugin from trying to correct the pitch of air and hisses. Also, use a De-Esser before Waves Tune RT.
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For the "T-Pain" / Modern Trap Effect: Set the speed to . This forces the pitch to "snap" instantly. "Every breath and sibilance (S sounds) sounds robotic