When Options > Event > Automatic Crossfades is selected, crossfades are automatically applied when you overlap two events on the same channel.
You can show or hide the crossfade length in a help tag choosing Options > Event > Show Crossfade Lengths or pressing Shift+Command+T.
Choose Edit > Mode > Event (or click the Event Mode button in an editor's playbar) to enable event-editing mode.
Drag an event so it overlaps another event on the same channel.
A crossfade is automatically added to transition between the two events.
An automatic crossfade is not inserted if a shorter event is placed on top of a longer event (as in a punch-in). You can manually create a crossfade to fade in to or out of the shorter event. This is a fast and effective method of punching in to replace a bad section of audio.
You can turn off automatic crossfades for longer events by deselecting Options > Event > Automatic Crossfades.
Choose Edit > Mode > Event (or click the Event Mode button in an editor's playbar) to enable event-editing mode.
Drag a shorter event so it overlaps a longer event, or drag an event with Automatic Crossfades turned off.
Hover over the upper-left or upper-right corner of an audio event until the fade offset cursor is displayed.
Click the corner of the event and drag to create a fade.
Repeat step 4 for the other end of the event.
You can change a crossfade to use one of many combinations of fast, slow, linear, smooth, and sharp fade curves.
Right-click the crossfade region to display a shortcut menu.
Choose Fade Type from the shortcut menu and choose a fade curve from the submenu:
If you want to change the default fade type that is used when fading an event in or out, choose Options > Event Default Fade In or Default Fade Out and choose a fade curve from the submenu.
The fade curve you choose will be used for new fades (existing fades are unaffected).