The Apprehension Engine: custom musical instrument generates natural nightmare noises

The Apprehension Engine is a custom-made musical instrument designed to produce the scary, tension-building noises associated with horror movies, but without the all-too-obvious digital chopping and synthesizing invariably involved. The result is something organic and seamlessly natural-something that goes beyond fear and fright to nail you to some deep Jungian place so completely you become a part of it. And she says I'm hard to shop for!

Christopher Bickel at Dangerous Minds:

"The Apprehension Engine," as it is called, was created by Canadian guitar maker Tony Duggan-Smith as a "one off" for Mark Korven, who is best known for his soundtrack work on The VVitch.

Compare to the classic analogue horror instrument, the waterphone:

https://www.youtube.com/watch?v=foSJstDFDfg