6
2.1.4 More about noise: Expanders and Noise-Gates
A lot of instruments such as microphones, amplifiers, guitar pickups, etc generate some noise, either at low frequ-
encies (hum) or at high frequencies (hiss) Such noise will inevitably interfere with the quality of your audio signal.
Now, if you scream into a microphone you will not hear the noise generated by such microphone because such
noise will be "masked" by the higher level of the signal, your voice in this case.
But if you sing into your microphone more gently in a soft passage, the level of the