So, someone here helped me making a script. (See below)
local Players = game:GetService("Players")
local RS = game:GetService("ReplicatedStorage")
local player = Players.LocalPlayer
local remote = RS:WaitForChild("RemoteEvent")
--Where the sound is located.
local sound = --location of your sound here relative to your script.
local function PlaySound()
sound:Play()
end
--Listen for events from the server.
remote.OnClientEvent:Connect(PlaySound)
I'm really thankfull! But, i don't know how to enter the PlayerGui (Containing Sounds. Want u use a LocalSoundScript that gets activated from a Brick) trough ReplicatedStorage,
I asked him the same question, but i think he's in a different time-zone that i am, so he's probably sleeping :P.

3 comments
(EDIT: The script above is placed in a LocalScript in ReplicatedStorage. The script that triggers this script, is a LocalScript in a brick in Workspace)
To enter the PlayerGui, simply do Player.PlayerGui. Local scripts will not do anything if they started off in workspace.
I reanswered your question in the first thread.