This brings to mind the work of composer Paul Lansky, who has been playing with voices to similar effect (albeit with a different process) since the 1980s.

Here's a brief description of one piece, "Notjustmoreidlechatter:" http://acousmata.com/post/104620348/notjustmoreidlechatter

His work can also be heard on Radiohead's Kid A: http://paul.mycpanel.princeton.edu/radiohead.ml.html