Morley HUM-X Ground Loop Hum ExterminatorRemoves Hum, Preserves Tone Hum is an unwelcome distraction. Thats exactly why Morley created the Hum Exterminator. It makes short work of the unwanted voltage and current in the ground line, which can cause ground loop hum. Whats more, it gives you a solid, safe ground, unlike those often dangerous devices that remove the ground altogether. We appreciate devices like the Hum Exterminator. These handy tools enable us to eschew volume and tone sucking