Perhaps I should/will... But, the monkey is on my back these days, not much time for fun or useful things. It does offer a little bang for less than a buck, if you can solder or even get creative with test clips.
Hmm, Speech Synth 2.0... Got me thinkin'... The sound chip responds quite fast, can produce white noise...
VODER (1939) - Early Speech Synthesizer
or maybe a 12-pole filter's function could somehow be approximated and excited by the generator.
Arduino Speech Synthesizer: Talkie Library LPC Speech Generator
Once again, sounds like a job for someone with more experience than I.