Examples of various AUDIO Editing tasks( no mixing ):

• Vocal tuning ( Melodyne or Auto Tune )
• Drum track editing ( tightening up a performance/recording in reference to a click or other tracks )
• Other instrumental rhythm editing or clean up ( such as noise , pops , clicks etc )
• File conversion ( sample rate or bit rate, file formats )
• Cutting / clean up  / file naming  of audio for sample libraries / film / video

Definition of Audio Editors designed for use with music:

* Edit the start time, stop time, and duration of any sound on the audio timeline

* Fade into or out of a clip (e.g. an S-fade out during applause after a performance), or between clips (e.g. crossfading between takes)

* Apply simple or advanced effects or filters, including compression, expansion, flanging, reverb, audio noise reduction and equalization to change the audio

* Conversion between different audio file formats, or between different sound quality levels

Typically these tasks can be performed in a manner that is both non-linear and non-destructive.