A low-frequency sine wave at around 30Hz, triggered by a noise gate keyed to a click track. A thumper is used to give filmed dancers the beat of a song while recording sync sound; the thumper is subsequently filtered out.
A low-frequency sine wave at around 30Hz, triggered by a noise gate keyed to a click track. A thumper is used to give filmed dancers the beat of a song while recording sync sound; the thumper is subsequently filtered out.