The Filters tab includes filters that improve or change the quality of the music. The so-called non-destructive procedure is used for processing, i.e. the actual recording is not changed, but flags are simply set that can be canceled at any time. No additional audio data is created. The audio files on hard drive are not modified during this procedure. 
The following configuration options are available in the Audio Track Properties window:
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Sets the volume of an audio file to a preset value. This filter can be useful to bring the volume of files originating from different sources into line with one another. 
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Removes clicking and scratching noises, such as those on old LPs for example. 
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Hiss Reduction
Reduces or removes the hiss on an audio file. All frequencies below a certain threshold (hiss level) are removed.
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Fade In
Fades in the volume of an audio file from zero to full volume. This filter can be useful for shortening files.
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Fade Out
Fades out the volume of an audio file from full volume to silence. This filter can be useful for shortening files.
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Stereo Widening
Increases/reduces the stereo effect of an audio file. This filter only works if the original file was recorded in stereo.
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Fades out the vocals on an audio file. This is done by fading out the parts of a song that are the same in both stereo channels.
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Adds an echo to the audio file.
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Opens an equalizer so you can change the volume, bass, and pitch in different frequency ranges.
Test Selected Filters
Plays the audio file and applies the activated filters. During playback, the configuration options for the filters can be changed, allowing the effect to be controlled.

Filters Tab