Hey there. Thanks for your report.
What do you mean that he lost his voice? Is Cayde speaking but you can't hear him?
English
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Yes. There are subtitles and character animation, but no sound only in Cade's.
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Thanks for the information. You may want to perform a [url=https://www.bungie.net/en/Help/Article/46501]scan and repair[/url] in the Battle.net app to see if that may help with your issue.