Apple Logic Pro 7 - Manual (Page 194)

194 Chapter 4 Audio in the Arrange Window
Non-destructive Fades
Fade In, Fade Out and Crossfades can be performed with the Fade tool, or with the
related parameters. The Fade In, Fade Out/X times and their curves can be found in the
Region Parameter box. You can simultaneously adjust these parameters in all selected
Regions.
These fade parameters are non-destructive (will not change the original audio file), as
opposed to the fade functions in the Sample Editor, or with the Glue tool.
Technical Discussion
A background fade file exists for each song. It contains all fade areas. You will not
normally need to access this file. This file is located in the same folder as the original
Region, and is named after the song, with the “-f16m” extension for 16 bit recordings, or
“-f24m” extension for 24 bit recordings”.
This background file is created the moment you start playback, after setting the first
crossfade for the song. If you are using numerous fades on multiple Regions, this could
take several seconds. A progress panel is shown during the creation of the fade file.
This method of creating fades is non-destructive. You can change the fade parameters
at any time, without changing the original audio files. The background file will be
updated and optimized automatically, whenever you save the song.
The fade file will also be updated after destructive changes are applied to the original
Regions/files in the Sample Editor.
Information about Regions and their Fade file
Use of the Audio File > Delete Fade File(s) option in the Audio window deletes the fade
file. No information will be lost by doing this, because Logic automatically creates a
new fade file the next time playback is started, based on the fade parameters of each
Region. Information about the number and sizes of fade files can be seen via Edit > Info.
If the song uses audio files from a number of different folders or drives, Logic creates a
corresponding number of fade files at these locations.