Apple Final Cut Pro 6 - Manual (Page 955)

170 Part I Audio Mixing
Looping Playback While Making Real-Time Filter Adjustments
Ordinarily, playing back your sequence clip in the Viewer plays back your entire clip,
from the starting position of the playhead forward. If you instead want to loop a
limited section of your clip as you adjust a filter’s parameters, you can enable Looped
Playback, set In and Out points to determine how much of your clip plays back, and use
the Play In to Out command to loop playback.
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.
2 In the keyframe graph ruler, move the playhead to the In point.
3 Choose View > Loop Playback to enable looped playback.
4 To loop playback, choose Mark > Play > In to Out (or press Shift-\).
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 press 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.
In and Out points in the
keyframe graph area