Pre-recorded sounds used to enhance the soundtrack with action sounds in the final mixing process, e.g. receding footsteps, falling rain, and opening doors. Jack Foley (1891-1967) pioneered the art of adding sound effects to movie soundtracks using mechanical devices like springs (comic effect), flapping cards (machine guns), and snapping celery (bones breaking). Nowadays, Foley sound effects use modern technology to gain some or all of the same results. But like the original mechanical sounds these are pre-recorded to enhance content in movies, as well as other media.