Apple Final Cut Pro 7 - Manual (Page 979)

To loop a section of a clip while making real-time filter adjustments
1 With your clip opened in the Viewer, set In and Out points in the keyframe graph area of
the Filters tab.
In and Out points in the
keyframe graph area
2 In the keyframe graph ruler, move the playhead to the In point.
3 Choose View > Loop Playback to turn on looped playback.
4 To loop playback, choose Mark > Play > In to Out, or press Shift-Backslash (\).
Playback loops repeatedly between the In and Out points, and you can make real-time
changes to any audio filter parameters.
To stop playback, press the Space bar or the J key, or click the Stop button in the Canvas.
Recording Audio Filter Automation
As long as the Record Audio Keyframes button at the top of the Audio Mixer is selected,
keyframes are recorded whenever an audio filter is adjusted during playback. Automation
recording begins when you position the pointer on an audio filter control and hold down
the mouse button, and recording continues until you release the mouse button. The
number of recorded keyframes depends on which option you choose from the Record
Audio Keyframes pop-up menu in the Editing tab of the User Preferences window.
To record audio filter automation
1 Choose Tools > Audio Mixer (or press Option-6).
2 Click the Record Audio Keyframes button at the top of the Audio Mixer to turn on keyframe
recording.
Tip: You can click the Record Audio Keyframes button to turn keyframe recording on or
off during playback, if necessary.
3 With your clip opened in the Viewer, move the playhead to the place in the keyframe
graph area in the Filters tab where you want to record audio filter automation.
It’s a good idea to start a few seconds before the section you’ll be mixing, to give yourself
time to get ready.
979 Chapter 59 Using Audio Filters