Florida did something interesting, and even better, it was done at the university where I am doing my grad work!
I’ve always thought that guys who burp the alphabet were neanderthals and it turns out I was right. Robert McCarthy of Florida Atlantic University’s Boca Raton campus worked with Phil Lieberman (who calculated the size of the larynx based on skull fossils in the 1970s) to actually reconstruct the vocal tract of the Neanderthal and simulate the sound of his voice. Hear it here.
McCarthy describes the sound as “part croaking frog, part burping human”, saying that Neanderthals “would not have been able to produce the quantal vowels that form the basis of spoken language”.