Sounds of the Nightmare Machine

Horror composer Mark Korven and guitar maker Tony Duggan-Smith show off the Apprehension Engine, a one-of-a-kind instrument built to produce terrifying sounds.

Hear the bizarre instrument behind modern horror's creepiest sounds.

What happens when a horror movie composer and a guitar maker join forces? They create the world’s most disturbing musical instrument. Affectionately known as "The Apprehension Engine," this one-of-a-kind instrument was c

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