How to tell a script to do something only if a value has increased?

So in the game I'm making, you're able to take over control points. Take over all of them and a value for your team called "Moral" is increased by 10, and the other team's value is decreased by 5. The problem is I only want to play a song if the value changes by a positive value, but I only know how to play the song if it changes in general. Here's my script below:

wait(1.2)


while true do
	wait(.1)
	local Moral = game.Teams.Prussians.Moral.Value
        local Moral2 = game.Teams.French.Moral.Value

	script.DieWachtAmRhein:Play()
	wait(102)
	script.FrenchAnthem:Play()
	wait(146.5)
	script.PreussensGloria:Play()
	wait(168.5) 

	
	function ChangedGerman()
	  if Moral == Moral + 10 then -- my attempt to only play a new song if
           --it changes by a positive value.
  
          script.DieWachtAmRhein:Stop()
	  script.FrenchAnthem:Stop()
	  script.PreussensGloria:Stop()
	  game.Workspace.GlobalSoundPlayer.Argonnerwaldlied:Play()
	
	  game.Teams.Prussians.Moral.Changed:Connect(ChangedGerman)
	  end
   end
end

if Moral >10 then
-- Whatever
end

That's what I'd think it'd be

As ABK2017 suggested, you need to create an old value and compare the value with the old one.

--Put these outside the while loop
local OldMoral = game.Teams.Prussians.Moral.Value
local OldMoral2 = game.Teams.French.Moral.Value

while true do
    local Moral = game.Teams.Prussians.Moral.Value
    local Moral2 = game.Teams.French.Moral.Value

	--stuff
	if Moral == OldMoral + 10 then
		OldMoral = Moral
		--Do other stuff
	end
end