trying to make a textbox that updates music volume and sound effects separately?

I'm making a menu with a textbox, where it modifies the volume of music played by a player, and a separate one for sound effects. I know what might be wrong, I just don't know how to fix it. Here is the script:

--variables
local DarkModeButton = script.Parent.DarkModeButton
local SettingsMenuFrame = script.Parent
local BlueModeButton = script.Parent.BlueModeButton
local LightModeButton = script.Parent.LightModeButton
local CloseButton = script.Parent.CloseSettingsButton
local SoundEffect = script.Parent.Parent.Sounds
local UserInputService = game:GetService("UserInputService")
local VolumeBox = script.Parent.MusicVolumeBox
local Music = game.ReplicatedStorage.Music

--functions
VolumeBox:GetPropertyChangedSignal("Text"):Connect(function()
	if VolumeBox.Text == "0" then--set value to zero. I tried it and it doesn't work. I also tried the enum.keycode thing but it doesn't work either
		for i,v in pairs(Music:GetChildren()) do
                if v.ClassName == "Sound" then
                Music:GetChildren().Volume = 0
	end
end)


DarkModeButton.MouseButton1Click:Connect(function()
	SettingsMenuFrame.BackgroundColor3 = Color3.new(0, 0, 0)
	for i,v in pairs(script.Parent:GetChildren()) do
		if v.ClassName == "TextButton" or "TextLabel" then
			Color3.new(1,1,1)
		end
	end
end)

LightModeButton.MouseButton1Click:Connect(function()
	SettingsMenuFrame.BackgroundColor3 = Color3.new(1,1,1)
	for i,v in pairs(script.Parent:GetChildren()) do
		if v.ClassName == "TextButton" or "TextLabel" then
			Color3.new(0,0,0)
		end
	end
end)
	
BlueModeButton.MouseButton1Click:Connect(function()
	SettingsMenuFrame.BackgroundColor3 = Color3.new(0,0,1)
	for i,v in pairs(script.Parent:GetChildren()) do
		if v.ClassName == "TextButton" or "TextLabel" then
			Color3.new(0,0,0)
		end
	end
end)

CloseButton.MouseButton1Click:Connect(function()
	SettingsMenuFrame:TweenPosition(
		UDim2.new(0.25,0,-4,0),
		"In",
		"Linear",
		1,
		true
	)
end)

for i,v in pairs(script.Parent:GetChildren()) do
	if v.ClassName == "TextButton" then
		v.MouseEnter:Connect(function()
			SoundEffect.HoverSound:Play()
		end)
	end
end

for i,v in pairs(script.Parent:GetChildren()) do
	if v.ClassName == "TextButton" then
		v.MouseButton1Click:Connect(function()
			SoundEffect.Click:Play()
		end)
	end
end

UserInputService.InputBegan:Connect(function(Input, gameProccessedEvent)
	
	if Input.UserInputType == Enum.UserInputType.Keyboard then
		
		if Input.KeyCode == Enum.KeyCode.S then
			SettingsMenuFrame:TweenPosition(
				UDim2.new(0.25,0,0.274,0),
				"Out",
				"Linear",
				1,
				true
			)
		end
		
	end
	
end)

idk how to include screenshots pls help thanks

On this line...

Music:GetChildren().Volume = 0

You're really checking to see if there is a child named Volume, and set that Volume to 0. You see, GetChildren() returns a table of Instances that are parented to the Instance the method is called from. Your script is probably erroring out when it tries to do this line of code.

What you can do is check if the music is currently playing by looping through GetChildren() and inspecting the audio's Volume property, checking if the Volume is not 0 while using IsPlaying.

IsPlaying coincides with IsPaused and its use is something of this nature, compared to IsPaused:

local sound = script.Parent:FindFirstChildWhichIsA("Sound")
sound:Play()
-- Going to wait a set amount of time

wait(sound.TimeLength / 4)

-- Now manipulate the status of the sound

if sound.IsPlaying then -- IsPlaying is read-only
	sound:Pause() -- Keeps the TimePosition; Stop() resets the TimePosition
	wait(sound.TimeLength / 8)

	if sound.IsPaused then -- Also read-only
		sound:Resume() -- Continue playing the sound from the saved TimePosition
	end

end