The Arrange window has a dedicated tool for making fades, and as you may have guessed, it's called the Fade tool. Fades created with the Fade tool are nondestructive, which means your audio files are not permanently altered in any way. Instead, when the song begins playing, a fade audio file is created on your hard disk, with one Region for each fade, and Logic refers to this fade file as it plays the fades.
Let's experiment with fades by creating a fade-in and a cross fade.
From the Arrange window's toolbox, grab the Magnifying Glass and drag around the Bongo Audio Region to zoom in.
Fades are hard to see unless you zoom in very close. With the Bongo Audio Region filling the Arrange area, it's easy to see the fades you'll make in the following steps.
From the toolbox, grab the Fade tool (the one with the sideways V on it; the Tool Tip says Auto Crossfade Tool).
Drag the Fade tool over the beginning of the first half of the Bongo Region.
A fade-in is created.
With the Fade tool still selected, hold down Control and click and drag up or down on the fade.
The pointer turns into a magnifying glass and the fade curves!
Fade curves are not available to Logic Express users. A cross fade is created in exactly the same way as a fade-in, except instead of dragging the Fade tool over the beginning of a Region, you drag across the boundary between two adjacent Regions.
Locate two adjacent Audio Regions in the Arrange window, and drag the Fade tool across the boundary between them. A cross fade is created between the Regions.
Hold down Control, and drag up or down on the cross fade.
The cross fade's center point moves left and right as you drag.
Logic Express users are not able to adjust the cross fade's center point.
Hold down Option and click the cross fade.
The cross fade is deleted.
For practice, go ahead and create a few fades. When you're done, click Play to hear what they sound like.
Before Logic plays your song, it creates a fade file that contains the added fades.
If your computer is quick or if the fades are small, the Progress dialog might not appear. The fade file itself is stored in a folder called Fade Files, located in the same directory as the song's project file. The fade file is named after the song, with the extension -f16m for 16-bit recordings, or -f24m for 24-bit recordings. If this fade file is moved out of the folder or goes missing, it's not a big deal. Logic will simply create a new fade file the next time you play the song.
If your Finder window is in column view (as shown in the figure above), you can play the fade file to hear what it sounds like. To enter column view in a Finder window, press Cmd-3 or click the Column View button in the top left corner.