EXCERPT From high-frequency crowd control systems, whispering windows, and directional ultrasound technology to haptic feedback devices using vibration within immersive VR, the parameters of the sonic are constantly re-engineered. We refer to such augmentations, which extend audition to encompass the imperceptible and the not-yet or no-longer audible, as unsound. The term refers not only to what humans cannot hear, but also to non-cognitive, inhuman phenomena connected to the unknown, including the hum, hyperrhythmia, and auditory hallucination…