When a sound editor mixes sounds from multiple sources, including diverse quality, levels, and placement it is called montage.
Audio Montage is a non-destructive multi-track editing environment that allows you to arrange, edit, playback and record audio tracks. Non-destructive means that when you delete or modify part of an audio file, that audio will not be permanently deleted or modified. Instead, a set of pointers keeps track of all changes so they can be easily undone.
Non-destructive editing features include both track and clip effects, volume and pan automation, and fade in and fade out functions. Audio Editing is a great tool for audio CD creation, mastering, multimedia work, radio production, and more.
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