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On the end credits of 'Chronos' (1985) HD-DVD it states recorded in "dbx six channel surround sound" I assume it would state same on the laserdisc pressings.
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Laserdisc pressings
Chronos (1985) [72333-80017-6]
Chronos (1985) [ID3548MM]
HD-DVD
Chronos (1985) [RB16009]
Chronos, The Ultimate (1985) [RBF-HD-90002]