Interesting piece here at Archeology dot org where you can hear someone speaking in Proto-Indo-European, which may not have sounded exactly like this but enough work has gone into it to suggest that it must be close.
http://archaeology.org/exclusives/articles/1302-proto-indo-european-schleichers-fable
http://archaeology.org/exclusives/articles/1302-proto-indo-european-schleichers-fable