How would I find if a part is behind a wall using raycast?

I'm trying to find any sounds that are behind a wall, but the script says it is always behind a wall. Here's my code:

--Services
local RS = game:GetService("RunService")
--Instances
local player = game.Players.LocalPlayer
local char = player.Character or player.CharacterAdded:Wait()
--Tables
local sources = {}
local ignore = {}

wait(1)

for i,v in pairs(workspace:GetChildren()) do
	for i,b in pairs(v:GetDescendants()) do
		if b:IsA("Humanoid") then
			table.insert(ignore,v) --Add all players/dummies to the ignore list
		end
	end
end

for i,v in pairs(workspace:GetDescendants()) do --Get the source of every sound in the game.
	if v:IsA("Sound") and v.Parent:IsA("BasePart") then
		for i,chars in pairs(char:GetDescendants()) do
			if v.Parent ~= chars then
				table.insert(sources,v.Parent) --Insert the source into a table
			end
		end
	end
end

while RS.RenderStepped:Wait(0.01) do
	wait()
	for i,source in pairs(sources) do
		wait()
		local ray = Ray.new(char:WaitForChild("Head").Position,source.Position) --Cast a ray to the source
		table.insert(ignore,char)
		local hit,pos = workspace:FindPartOnRayWithIgnoreList(ray,ignore)
		if hit and hit.Name ~= source.Name then  --Find if the player is behind a wall or not
			print("Behind a wall")
		else
			if hit and hit.Name == source.Name then
				print("Not behind a wall")
			end
		end
	end
end