These filters help get rid of unwanted noise that the Noise Reduction tool cannot register. You may use this filter if there is a low rumble or hum in you track that you want to reduce or even just to reduce the drums or the base line in a track. You may use this filter if there is an unwanted high pitch noise in your audio file, like a buzz or hum or just to bring down some higher pitches. The Low Pass Filter reduces higher frequencies by not letting them pass through. These tools allow you to clean up the audio file and create a better sounding track.
To reduce high and low pitch frequencies in an audio track you use the Low Pass Filter and the High Pass Filter.
