function ENT:Initialize()
	self.snd=CreateSound(self.Entity,Sound(self.EngineSound))
end

// ...

function ENT:Think()
	if (self.running) then
		self.snd:Play()
	else
		self.snd:Stop()
	end
end

// ...

function ENT:OnRemove()
	self.snd:Stop()
end