Apple Final Cut Express HD - Manual (Page 512)

512 Part VII Fine-Tuning Your Edit
Quickly Adding the Default Transition to Clips in Your Sequence
You can quickly add the default transition between two clips in your sequence. The
default video transition is a 1-second cross dissolve and the default audio transition is
a +3 dB cross fade.
To add the default video transition, do one of the following:
m Select an edit point between two video clips or position the Canvas or Timeline
playhead at the desired edit point, then press Command-T.
m Control-click an edit point between two video clips in the Timeline, then choose Add
Transition from the shortcut menu.
The name of the current default transition appears next to the command in the
shortcut menu.
If there are enough overlapping frames on both sides of the edit point, the selected
transition is added to your edit, centered at the edit point.
Select an edit point where you
want to add a transition.
The added transition,
centered on the edit point.