Is This The Voice Of Robin Williams, This Man Thinks So, You Decide
I follow Steve Huff of Huff Paranormal, he uses some equipment that isn't scientific, but he gets results. In fact, I value his opinion and have used some of the equipment that he recommended and have had great results myself. In this clip he tries to contact Robin Williams and it sounds like he has.
If you don't want to listen to him talk about how he captured these or why he is posting them, skip to 8:02.