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Creep
The Creep mechanic allows for your noise to be quieter when you move by shifting/crouching, or using Rogue's Creep perk.
Normal
Sound completely falls off at 20 meters.
Shift Walking
Sound completely falls off at 10 meters.
Crouching
Sound completely falls off at 15 meters.
Creep perk
When using Rogue's Creep perk, sound is completely silent when Crouching.