Melody Makerdescribed how to control pitch and other parameters in the speak function on MAC.
https://msdn.microsoft.com/en-us/library/ms717077(v=vs.85).aspx describes how to do something similar with Microsoft Anna.
Attached script pretends to read a poem in two voices at opposite ends of Anna's range.
The pitch changes on periods, question marks, and exclamation marks (note = -note).
Song borrowed from The Mock Turtle's Song - Wikipedia, the free encyclopedia