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Layer Based vs Destructive Audio Editing

This post is part of a series called Editing Audio: The Complete Guide.
Make a Crazy Drum and Bass Breakbeat by Slicing and Dicing in FL Studio
Editing And Using .REX Files

Simple editing such as fades, trims and normalisation is normally destructive, making it difficult to undo just part of what you've done. Layer based editing is non-destructive, making it possible to selectively undo your edits. In this screencast tutorial, Mo Volans contrasts editing in Wavelabs 7 and Soundtrack Pro to show you the difference.