You’ll be spending a lot of time in the Viewer window. Not only do you use the Viewer to play clips and mark edit points and keyframes, you also work in the Viewer to sculpt audio and video with effects and filters.
The Viewer window interface uses tabs to organize and display the clip controls. You’ll see only the tabs that are relevant to the clip that’s currently open; not all tabs are open by default. Following are summaries of the functions available on each tab:
Video tab: View video frames and set In and Out points and keyframes. This is the default playback window for a video clip.
Audio tab: Audition and mark edit points in audio-only clips. This is where you can set the level and pan or spread. ...