恐怖片的音效一般是怎么做的？

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VIDEOS
MP4	N/A	480P	Download
MP4	N/A	480P	Download
MP4	N/A	480P	Download
MP4	N/A	360P	Download
MP4	N/A	360P	Download
MP4	N/A	360P	Download
AUDIO
MP4	N/A	mp4a.40.2	Download
MP4	N/A	mp4a.40.2	Download
MP4	N/A	mp4a.40.2	Download
THUMBNAILS
	JPEG	Origin Image	Download

视频素材来源：https://www.youtube.com/watch?v=T6jn3fXr2XY
https://www.youtube.com/watch?v=foSJstDFDfg
https://www.youtube.com/watch?v=CNFtsnWFGn4
https://www.youtube.com/watch?v=A5eu6ZIRW-M