is there a way for a tween script to have a constant color change?

local RGB = Color3.fromRGB()



--// Tween Preset Function
local newtween = function(obj, props, speed, ...)
    local info = TweenInfo.new(speed, ...);
    local tween = game:GetService("TweenService"):Create(obj, info, props);
    return tween:Play()
end

--// Local Button Variables
local button = script.Parent -- This is your local Button
local toggle = false -- This is your local toggle variable

--// Full Button Operation
button.MouseButton1Down:Connect(function()
    toggle = not toggle -- On click sets the local Toggle var to TRUE if starting at false; else back to FALSE.
    if toggle then -- If Toggle is TRUE then run newtween to WHITE.
        newtween(button,{BackgroundColor3 = RGB},0.3,Enum.EasingStyle.Sine,Enum.EasingDirection.In);
    else -- Else if Toggle is FALSE then run newtween to BLACK.
        newtween(button,{BackgroundColor3 = Color3.fromRGB(57, 57, 57)},0.3,Enum.EasingStyle.Sine,Enum.EasingDirection.Out);
    end
end)



while wait() do
    function color(X) return math.acos(math.cos(X*math.pi))/math.pi end

    value = 0

    if script.Parent.Parent.Parent.Parent.Menus.OptionsMenu["Top Bar"].RGB.Value == 1 then

        while true do
            wait(0.005)
            RGB = Color3.fromHSV(color(value),1,1)
            value = value + 0.005
        end 

    else  
        RGB = Color3.fromRGB(170, 85, 255)
    end
end

what this script does it change the background color of the button that you click to the current RGB value but it only does the value that is active when you click the button. is there a way to have the background change during and after the tweeting is done?