How can I get a song's max playback loudness?

Help and Feedback Scripting Support
22

As @colbert2677 covered most of it already you might want to also look into CompressorSoundEffect as it works as a normalizer to keep a consistent volume level all the time for any sound.

If you’re absolutely set on the PlaybackLoudness for other uses as well you can try this out for a more consistent result:

local RunService = game:GetService("RunService")
local SoundService = game:GetService("SoundService")

local function MaxPlaybackLoudness(soundId, scrubTime, scanAmount)
	local ListPlaybackLoudness = {}
	local MaxPlaybackLoudness = 0
	local ScanSection = 0
	local ScanFinished = false
	
	local Sound = Instance.new("Sound")
	Sound.Parent = game.SoundService
	Sound.SoundId = soundId
	
	repeat RunService.Stepped:Wait() until Sound.IsLoaded

	print("Scrubbing soundId:", Sound.SoundId)
	local startTime = tick()
	
	for soundTime = 0, Sound.TimeLength, scanAmount do
		ScanSection = ScanSection + 1
		spawn(function()
			local scrubSound = Sound:Clone()
			local startScrub = tick()
			scrubSound.Parent = game.SoundService
			scrubSound.Volume = 0
			scrubSound:Play()
			scrubSound.TimePosition = soundTime
			local ScrubStep = RunService.Stepped:Connect(function()
				table.insert(ListPlaybackLoudness, scrubSound.PlaybackLoudness)
			end)
			repeat RunService.Stepped:Wait() 
			until (tick()-startScrub) > scrubTime
			ScrubStep:Disconnect()
			scrubSound:Stop()
			scrubSound:Destroy()
			scrubSound = nil
			if ScanSection >= soundTime then 
				ScanFinished = true 
			end
		end)
	end
	repeat RunService.Stepped:Wait() until ScanFinished
	Sound:Destroy()
	Sound = nil
	print("Completed scrubbing:", tick()-startTime)
	print("Peak audio loudness:", math.max(unpack(ListPlaybackLoudness)))
end

--[[MaxPlaybackLoudness
	soundId: audio id to fetch
	scrubTime: amount of seconds to record pbl for sound instance
	scanAmount: amount of seconds to create sound instance
]]--

MaxPlaybackLoudness("rbxassetid://203626633", 2, 2)
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