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The earliest consumer version of Dolby's multichannel analog film sound format Dolby Stereo was Dolby Surround.

When a Dolby Surround track is produced, four channels of audio information—left, center, right, and mono surround—are matrix-encoded onto two audio tracks.

The Dolby Surround decoding technology was updated during the 1980d and re-named Dolby Pro Logic.