How do I increase its volume sound when approaching an object of it?

Unity Engine
1

Hi! How do I increase a volume sound when approaching an object of it?

2

Set the sound file to 3D Sound in the Inspector.

Then set the 3D Sound Settings on the object with the Audio Source attached.

3

I got it! To works have we to active the box “3D Sound” in sound properties.
I even make some changes to certify, converted to .mp3 format.
And don’t use GameObjects, just insert the sound straight to the Hierarchy window.