stopfmaschine employs active infra-red sensors and light dependent resistors to drive a microcontroller-hosted granular synthesis engine and trigger recorded samples of the clicks of dying hard drives and the groans of stress-induced metal fatigue. A servo-driven pendulum modulates the live sound synthesis based on viewer presence and proximity. stopfmaschine was exhibited at Gro{o}ve, a show curated by Professor Margaret Schedel at SUNY Stony Brook’s SAC Gallery, New York. Seven international sound artists were selected to present new sound object work; All of the pieces were both sonic and sculptural, and most were, in some way, aware of viewers in the space.