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In some areas, the game may have a heavy echo effect on the audio, where music and/or sound effects will echo and become extremely loud, while voices will become difficult to hear. This seems most common in indoor and underground areas, such as the MechaBioCon facility, the subways, and the sewers.
While the game offers the option to replay most of the missions using the black suit, there is no actual New Game Plus option. If you want to play the game with all upgrades, you can use a modified save file.