Judging by the patches so far and their lack of action on any feedback presented here, "change" clearly isn't a word found in Bungie's dictionary.
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give it some time, least a month or so.
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This is something that they shouldn't need time for, it's a no brainer, it should have been in the game from release. It's not rocket science, 99.9% of games have sound options, limited or extensive, this game has none.
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I would assume it's on their list as they are stabilizing the game first.