noise gate

Behringer NR300 Noise Reducer Guitar Effects Pedal Noise Reduction Pedal for Electric Guitar
  Behringer NR300 Noise Reducer Guitar Effects Pedal (NR-300 / NR 300)

Take noisy buzz and hum out of your guitar signal, with the Behringer Noise Reducer NR300 pedal. the Behringer Noise Reducer NR300 is an effective solution for cleaning up your tone.