Automatic music player help?

Ok so I recently I tried adding a Auto Player to my game, and it worked (for the most part) but now when I tried to add it so the songs fade out at the end and in on the beginning, Nothing works anymore and there are no error outputs. ????

local x = game.Workspace.DJBoardPRO
local o = script.Parent.Parent.Parent

script.Parent.MouseButton1Click:connect(function()
    local Songs = {--200 song ID's--}
    if script.Parent.Text == "Auto Players current status: Off" then
        script.Parent.Text = "Auto Players current status: On"
        while script.Parent.Text == "Auto Players current status: On" do
            o.Header.Text = "AutoPlayer is on"
            x.Sound:Stop()
            x.Sound.Volume = 0
            x.Sound.SoundId = ""
            wait()
            x.Sound.SoundId = "http://www.roblox.com/asset/?id=" .. Songs[math.random(1, #Songs)]
            x.Sound:Play()

                function In() --Where I need help--
                    for i = 0, 1, 0.01 do
                    wait(1)
                    x.Sound.Volume = i

            wait(100)

                function Out() --Where I need help (x2)--
                    for i = 1, 0, -0.01 do
                    wait(1)
                    x.Sound.Volume = i

            x.Sound:Stop()
            x.Sound.SoundId = ""
                        end
                    end
                end
            end
        end
    else
        if script.Parent.Text == "Auto Players current status: On" then
            script.Parent.Text = "Auto Players current status: Off"
            o.Header.Text = "DJ-Board (Revised) V.15.2"
            x.Sound:Stop()
            x.Sound.SoundId = ""
            script.Disabled = true
            wait()
            script.Disabled = false
        end
    end
end)