PDF (adobe.com)

Maintaining video synchronization when editing audio

When you edit audio from a video file, trim handles and the Cut, Delete, and Crop commands silence audio without changing file length. This approach maintains synchronization, so you can easily incorporate edited audio into your video projects.

Trim handles silence audio, maintaining video synchronization. (The Cut, Delete, and Crop commands do the same.)

By default, the Video panel appears when you open a video file. If you find video distracting, deselect Auto-Open Video Panel in the General section of the Preferences dialog box. Alternatively, to display the Video panel more prominently, choose Window > Workspace > Edit Audio to Video.