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Footstep Sound
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.
Crouching
Sound completely falls off at 15 meters. Somewhat quieter footsteps than walking.
Shift Walking
Sound completely falls off at 10 meters. This is the quietest method of walking.
Creep perk
When using Rogue's Creep perk, sound is completely silent when Crouching.