AmbientReverb Not Working Even When I Change It?

this is the local script in starter character scripts that doesnt change the ambient reverb

errors: cannot assign reverbtype cannot be assigned to (line 6)

dont know how to fix plz help

local character = script.Parent
local foot = character:FindFirstChild("LeftFoot") or character:FindFirstChild("RightFoot") or character:FindFirstChild("Left Leg") or character:FindFirstChild("Right Leg")

foot.Touched:Connect(function(otherPart)
	if otherPart and otherPart.Name == "beeaaaaa" then
		game.SoundService.AmbientReverb.ReverbType = 9
		game.SoundService.jazz.Playing = true
		wait(1.3)
		game.SoundService.jazz.Playing = false
		game.SoundService.AmbientReverb.ReverbType = 0
		game.SoundService.jazz.TimePosition = 0
	end
end)