They didn't update them. They just muffled or ruined them.
Charizard, Gengar, Fearow, Persian, all lost their iconic, beautiful cries. I'm scared to hear Jynx, Articuno, or Mewtwo, because I'm afraid they ruined those too.
What the hell were they thinking? When I heard they were updating cries, first I was excited, because I thought that meant they'd be recreated with higher sound quality. Nope, they just changed the texture, muffled them, clipped them to almost nothing, or made them sound like farts. Utterly terrible.