If you want to adjust the gain of a master clip so that all instances of the clip added to the Timeline panel have the same gain level, select the master clip in the Project panel.

If you want to adjust the gain of just one instance of a master clip already in a sequence, select the clip in the Timeline panel.

Enter a Gain value. (0.0 dB equals the clip’s original gain.)

Click Normalize to optimize a clip’s audio gain automatically. Adobe Premiere Pro examines levels in the clip. It then determines how much to adjust the audio so that the strongest signals in the clip don’t exceed the ceiling level (0dB) and create distortion. The displayed value indicates the amount of gain Adobe Premiere Pro automatically applied.