System information
4.  You can adjust the automation by editing the envelope in the timeline or by clicking the Mute 
Automation button   in the track header. For more information, see "Adjusting Envelopes" on 
page 266.
Click the Automation Settings button   in the track header to toggle between Mute and Mute 
Automation modes.
When you apply mute automation to a track, it's possible to have a track that is muted and 
soloed simultaneously if you use the Mute  and Solo  buttons in the track header. The 
mute state overrides the solo state:
n  If a track's Solo button is selected, the track is included in the solo group, but it will be 
muted whenever the mute automation is set to mute the track.
n  If the track's Mute button is selected, the track is muted regardless of the mute 
automation settings.
Apply composite-level automation
Composite-level automation allows you to vary the opacity/transparency  of a video track and has a similar 
effect to adjusting the Level  slider in the track header.
The Compositing Mode  button   determines how the transparency in a video track is   generated. Since 
lower tracks show through higher tracks, it is the compositing  mode of the higher track that determines how 
much of the lower track shows  though. The compositing mode of the lowest video track has no effect on  a 
project. For more information about compositing, see "Compositing and Masks" on page 385.
1.  Select a video track.
2.  From the Insert menu, choose  Video Envelopes,  or right-click in the track list and choose 
Insert/Remove  Envelope from the shortcut menu.
3.  From the submenu, choose Track  Composite Level.
If the track already contains a composite  level envelope, it will be removed. If the track does not 
contain a composite-level  envelope, it will be added with a setting of 100%  for the duration of the 
track.
4.  If you want to change the  track's composite level throughout the track, edit  the envelope in the 
timeline. For more information, see "Adjusting Envelopes" on page 266.
5.  If you want to change  the composite setting by recording automation, select the Automation  
Settings button    in the track header. The slider thumb is displayed as a   in automation mode.
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