LocalSound Help Please?

I'm trying to make Ambiance for my game, whereas if you step outside a house, the wind sound will get louder. I have 2 bricks, one for lowering the volum and the other for increasing the volume. I already have a script to get the sound playing, however the script doesn't work. It's a local script inside the brick.

local parent = script.Parent

parent.Touched:connect(function(hit)
	if hit and hit:findFirstChild("Humanoid") and game.Players:GetPlayerFromCharacter(hit) then
		local p = game.Players:GetPlayerFromCharacter(hit)
		local c = hit.Parent
		local sound = p:findFirstChild("OutdoorAmbient")
		if sound then
			sound.Volume = 0.3
		end
	end
end)

Please note that someone gave me this script on the forums and told be it should be local.

EDIT: The sounds are located in the player's StarterGUI

This may be wrong, but you said the sound is in the player's PlayerGui, so your script should read:

local parent = script.Parent

parent.Touched:connect(function(hit)
    if hit and hit:findFirstChild("Humanoid") and game.Players:GetPlayerFromCharacter(hit) then
        local p = game.Players:GetPlayerFromCharacter(hit)
        local c = hit.Parent
        local sound = p.PlayerGui:findFirstChild("OutdoorAmbient")--Set it to look in the playergui
        if sound then
            sound.Volume = 0.3
        end
    end
end)

And put it in a normal script, localscripts don't work in bricks.