Altsound – Back to the Future (Data East 1990)

The latest version of VPinMAME is required for this altsound to work (10 Dec 2020 or later)
https://www.vpforums.org/index.php?showtopic=27063

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Brougt to you by Apophis & iDigStuff

Big thanks to iDigStuff for the testing and providing some much needed tweaks.

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