The question pretty much says it all. On Wikipedia it states
In 1993, Recorded Books Inc. released a 20-disc audio book narrated by George Guidall. In 2007, Audio Renaissance released an audio book narrated by Simon Vance with some parts acted out by Scott Brick, Orlagh Cassidy, Euan Morton and other performers.
Is anything missing from this list. This is from the Dune page, did he record any of the later Dune books in audio format himself?