Enum.RollOffMode

How Sounds parented to a BasePart or Attachment attenuate (fade out) as the distance between the listener and the parent increases.

Items4

Enum.RollOffMode.Inverse = 0
Volume attenuates from Sound.RollOffMinDistance in an inverse manner, mirroring how sounds attenuate in the real world. This is done through Sound.RollOffMinDistance/distance, where distance is the Vector3.Magnitude between the audio source and the audio listener.
Enum.RollOffMode.Linear = 1
Volume attenuates between Sound.RollOffMinDistance and Sound.RollOffMaxDistance with a linear relationship. This is done through (Sound.RollOffMaxDistance/distance)/(Sound.RollOffMaxDistance-Sound.RollOffMinDistance), where distance is the Vector3.Magnitude between the audio source and the audio listener.
Enum.RollOffMode.LinearSquare = 2
Volume attenuates between Sound.RollOffMinDistance and Sound.RollOffMaxDistance with a linear squared relationship. This is done through squaring Linear.
Enum.RollOffMode.InverseTapered = 3
A hybrid model which follows the Inverse model when close to Sound.RollOffMinDistance and the LinearSquare model when close to Sound.RollOffMaxDistance. This is done by taking the lesser of Inverse and LinearSquare.