PlaybackLoudness
A number between 0 and 1000 indicating how loud the Sound is currently playing back.
This property reflects the amplitude of the Sound's playback in the instance of time it is read. Therefore, for most sounds it will fluctuate constantly. Due to this it can appear in the Roblox Studio properties window as 0, however when read by code in the command bar or Scripts it will return the correct value.
Code Samples
Volume Amplitude Bar
In this sample Sound.PlaybackLoudness is used to create an amplitude bar that shows the amplitude of a sound playing.
This code sample should be placed in StarterPlayerScripts.
A simple GUI is created, a frame holding that bar and a frame containing the bar. A Sound is then played and the size of the bar is set to reflect the Sound.PlaybackLoudness on a loop.
-- to be placed in StarterPlayer > StarterPlayerScripts
local Players = game:GetService("Players")
-- wait for local player PlayerGui
local LocalPlayer = Players.LocalPlayer
local playerGui = LocalPlayer:WaitForChild("PlayerGui")
-- create a ScreenGui
local screenGui = Instance.new("ScreenGui", playerGui)
-- create a holder for our bar
local frame = Instance.new("Frame", screenGui)
frame.AnchorPoint = Vector2.new(0.5, 0.5)
frame.Position = UDim2.new(0.5, 0, 0.5, 0)
frame.Size = UDim2.new(0.3, 0, 0.05, 0)
-- create a bar
local bar = Instance.new("Frame", frame)
bar.Position = UDim2.new(0, 0, 0, 0)
bar.Size = UDim2.new(1, 0, 1, 0)
bar.BackgroundColor3 = Color3.new(0, 1, 0)
-- create a sound
local sound = Instance.new("Sound", screenGui)
sound.SoundId = "rbxassetid://301964312"
sound.Looped = true
sound:Play()
-- define a max loudness
local maxLoudness = 30
-- animate the amplitude bar
while true do
local amplitude = math.clamp(sound.PlaybackLoudness / maxLoudness, 0, 1)
bar.Size = UDim2.new(amplitude, 0, 1, 0)
wait(0.05)
end