Apple Final Cut Pro 7 - Manual (Page 1427)

• Clips with compositing modes applied can never play back in real time, so they are
ignored and only clips on lower-numbered tracks are displayed. Of course, a clip on a
lower-numbered track that has a compositing mode applied will also be ignored.
• Transitions that cannot be played back in real time are disabled, so only the underlying
clip media is displayed.
The Play Base Layer Only option also affects audio playback. When playing over an
unrendered portion of a sequence, no effects are played back. The number of audio tracks
that play depends on whether or not you have selected the Play Base Layer Only option.
• If selected: The first two tracks of audio play back.
• If unselected: The number of audio tracks that play back is determined by the number
of real-time audio tracks you have set in the General tab of the User Preferences window.
This video transition is
not shown in the Canvas.
Unrendered audio plays
back without effects.
The clip in track V1 is shown
in the Canvas without effects.
The clip in track V2 is shown
in the Canvas without effects.
Beep When Playing Unrendered Audio
This option is available only in the Playback Control tab of the System Settings window.
When this option is selected, audio clip items that require rendering are played back as
audible beeps. This is the audio equivalent of the “Unrendered” screen you see when
your video requires rendering. If the Play Base Layer Only option is not selected, the beeps
are not heard. For more information, see
“Play Base Layer Only.”
1427 Chapter 84 Using RT Extreme