Apple Final Cut Pro X (10.0.9) - Manual (Page 207)

Chapter 10 Add transitions, titles, effects, and generators 207
Add transitions to your project
There are several methods you can use to add transitions to your project. Once a transition is
added, you can adjust its parameters. You can also modify the transition effect in Motion.
Add a cross dissolve
1 Choose the Select tool from the Tools pop-up menu in the toolbar (shown below), and click the
edge of a clip (an edit point) in the Timeline.
One or both clip edges are highlighted.
Note: If you select a whole clip in the Timeline instead of just an edit point, transitions are added
at each end of the selected clip.
2 Choose Edit > Add Cross Dissolve (or press Command-T).
The cross dissolve is inserted using the “Apply transitions using” setting. For more information,
see
Set transition defaults on page 206. If the video clip has attached audio, a crossfade transition
is applied to the audio.