David Cattanach came through in more than one Leslie Flint seance, at times speaking with his mother who was one of the sitters. In this seance, David carries on a conversation with his mother about the afterlife, his level of consciousness, and what he is doing there.
The vocal mechanism uses the vocal chords to create the vibrations that we hear when someone speaks. When someone doesn't use the vocal chords to create sound, but uses a constricted pharynx to give a "hissing" sound, we call it a "whisper." The rest of the vocal mechanism creates words in the same way as it does with the vocal chords sounds. We aren't sure why David and some of the other speakers were not able to use the ectoplasmic vocal chords to create a sound, but they create a strained whisper speaking voice.
26 minutes, recorded in 1979