High above the base, Ketha crouched before the machinery which generated the alegoyle deterrent music. It was her task this morning to activate it. The control mechanism was secured to the wall in front of her but the amplification and broadcasting of the signal went through a much smaller portable device, which clipped into a socket at the top. These amplifiers were remarkable pieces of equipment. The creature used one to broadcast its own translated voice and it kept several spares here. Once before, Ketha had been instructed to replace the alegoyle screen amplifier and from watching how the creature used it, she had learned a lot about the way the amplifiers worked. "Can you bring me one?", Klane had asked when they plotted in whispered interludes between their love making.