In Final Cut, there may be times when you want to change the speed of a clip, but not it’s overall duration in the Timeline.
To do this, put your playhead over the clip and press Alt/Opt+Cmd+F. This loads a copy of the clip into the Viewer. There are no In or Out points. Next, go to the Modify > Speed menu (Cmd+J) and change your speed to say, 30%. Grab your clip and do a Replace edit.
Depending on your footafe, you may want to send the clip to Motion and apply Optical Blending to clean up any ghosting that you get.Apple, Final Cut, Mac OSX, Motion Apple, Final Cut, Keyboard shortcuts, Motion