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From DarkAI

AI SET ENTITY HEARING RANGE

This command sets the range at which an entity can hear sounds added to the AI system. Sounds can also have a radius of their own, if this radius plus the entity's hearing range is greater than the distance between the two then the sound is heard. If you want to stop the entity hearing sounds altogether use the AI Set Entity Can Hear command.

Syntax
AI Set Entity Hearing Range Entity Number, Radius#

Parameters
Entity Number, The id of the entity to set the hearing range.
Radius#, The radius within which the entity can detect sounds.

Return
n/a