Adding Volume mixed up

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1

I want to make a dev product that adds volume to a sound when you buy it. Whenever you but the dev product it starts by adding .5 so it works. then it adds an extra .5 per purchase so after the first purchase it adds 1 then 1.5 then 2 and so on.

Here is the code and a video


local one = 1501302078

local two = 1501302364

local MarketplaceService = game:GetService("MarketplaceService")

local players = game:GetService("Players")


local function processRecipt(reciptInfo)
	print("e")
	local plr = players:GetPlayerByUserId(reciptInfo.PlayerId)
	if not plr then
		return Enum.ProductPurchaseDecision.NotProcessedYet
	end
	
	if reciptInfo.ProductId == one then
		

	if plr then
		--if reciptInfo.PurchaseId == one then
			print(plr.Name)
			--local next = plr.Character.HumanoidRootPart.talking.Volume + 1
			plr.Character.HumanoidRootPart.talking.Volume += .5
			print(plr.Character.HumanoidRootPart.talking.Volume + .5)
			print(plr.Character.HumanoidRootPart.talking.Volume)


	end
	end
	if reciptInfo.ProductId == two then
		print("t")
	end
end