Can i have help with an audio volume decrease when your away from it?

Okay...you have to use something called magnitude, which will check the points of the Player's Torso to a certain Part. In the case of what you're doing, here is what your script would look like (please note that this script is meant for a button that plays music or a sound) :

char = script.Parent.Parent.Character
part = script.Parent.Parent
audio = script.Parent
bool = true
function onTouch()
    if bool == false then return end -- Debounce ensures that this only occurs once
    bool = false
    if part:FindFirstChild("Humanoid") ~= nil then
        audio:Play()
        if char.Torso.magnitude > part.magnitude then
            for _,i in pairs(char.Torso.magnitude >= part.magnitude) do -- For every time the Player's Torso is far away...
                audio.Volume -= 0.1 -- Decrease the volume
            end
        end
    end
    wait(5)
    bool = true
end
part.Touched:connect(onTouch)   

This is only my attempt to do what you're doing and I apologize if I am wrong. However, I believe that it is indeed necessary to use magnitude.

Usefull links:

link1

link2

EDIT:

If you take a look at the fist link, it talks exactly about what you are requesting help with: 3D sounds. For detailed information in regards of the properties of the Sound instance, in order for you to build up your 3D sound, I left you the second link.

You can try adding "sound" to your workspace.

Then you can replace the idea and change the volume or whatever the property you change.

Then add a script (put inside of the sound) and type.

 script.Parent:play()

if you don't want to add a script to the sound, try

game.workspace.sound:play()

either works fine.