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that was made for forcing the game to output 5.1ch when you encountered a bug where Witcher 3 only output in Stereo. but from the replies, it seems also fixed the missing voice or muddled voice problem when running Withcer 3 with 5.1ch surround sound.

It will affect other games although currently confirmed bad effect only on Watch Dogs (no audio).
Post edited May 21, 2015 by orangpelupa