Creating a monotonic sound

I am a new user in Audacity. I am going to test the prosodic sentences in an psychological experiment. I need to have monotonic (without prosody) sentences as well in order to compare them with the prosodic ones. However, I can’t create fully monotonic sentences with a natural sound recording. Can I manipulate my voice after recording in Audacity and make it more monotonic? How?

No native effects in Audacity to dynamically correct pitch.
Need a pitch-correction plugin. I only have 20 year old 32-bit ones which are buzzy …