thats a great idea, i completely forgot about that!
playing with some comb filters would also sound pretty nice, especially on whispers.
on OSX there is a very splendid selection of included voices that you can control with supercollider3. theres about 15-20 something different voices. you can control everything you could imagine when dealing with the voices also. everything from HAL to a histerical laughing voice. theres even some that work on rythyms. i havent figured out if the rythyms can be changed yet but im hoping they can. i’m lead to beleive that since sc3 can do this max/msp and pd should also be able to partake in this.
like something along the lines of Hrvatski’s Catstep/My Kitten/Catnap Vatstep dsp Remix.