First film with Dolby sound

According to Official Guinness Records,

Dolby is a noise reduction system designed to eliminate hiss from recorded sound. Stanley Kubrick's A Clockwork Orange (UK 1971) used Doby noise on all pre-mixes and masters, though the release prints had a conventional optical soundtrack.

For a complete list of 1971 records, please visit 1971 Guinness Records in United Kingdom.

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