Adobe Premiere Pro CS6 - Manual (Page 209)

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Targeting a track while dragging a clip to a sequence
When you add clips to a sequence by pasting, (or keyboard shortcuts), you must specify target tracks in advance. You can target more than
one video track or more than one audio track at a time. Also, you can choose to target a video track only or an audio track only. Click the
track or tracks you want to target in the track header area of a Timeline panel. The track header area for a targeted track appears
highlighted.
You can also assign keyboard shortcuts to some track targeting commands.
Highlighted track header of targeted video and audio tracks
If you overwrite a clip, only the clips in targeted tracks are affected, whether you drag the clip or use a Source Monitor’s Overwrite button.
If you insert a clip, the clip goes into the targeted tracks, and clips in any unlocked tracks where the source clip lands shift to accommodate the
insertion. You can specify other tracks to also shift by enabling Sync Lock on them.
To insert a clip and not shift clips in other tracks, Ctrl-Alt-drag (Windows) or Command-Option-drag (Mac OS) the clip into the track.
You can drag video clips to any video track; however, you can drag audio clips only to a compatible audio track. Audio clips can’t be added to the
master audio track or submix tracks, and they can be placed only on audio tracks of the matching channel type: mono, stereo, or 5.1 (see Audio
tracks in a sequence).
Clips with linked video and audio can be dragged to either a video or an audio track, but the clip’s video and audio components appear separately,
in the appropriate corresponding tracks.
Note: You can drag a clip to any unlocked, compatible track in a sequence, no matter which tracks are currently targeted. You can’t target a
locked track. Locking a target track deselects it as the target.
For more information about targeting and patching tracks in Premiere Pro, see this video by Learn by Video and Video2Brain by Maxim Jago.
Andrew Devis shows how to use Sync Lock and track targeting in this video on the Creative COW website.
Frank Rohmer provides a video tutorial on the Adobe website that explains mapping source tracks to target tracks.
Drag video and audio to a sequence
By default, when dropped into a sequence, the video and audio components of linked clips appear in corresponding tracks (for example, Video 1
and Audio 1), unless the audio channel type of the clip is incompatible with the target track. In this case, the linked audio appears in the next
compatible track, or a compatible track is created automatically.
Note: An audio clip dragged to an incompatible track automatically shifts to the next compatible track, even if the track is occupied by another
audio clip. Therefore, take care not to disturb clips already in the sequence.
However, you can alter this behavior by holding the Shift key while you drag.
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