What is necessary to perform when synchronizing audio and video in Media Composer?

To effectively synchronize audio and video in Media Composer, aligning the audio waveforms with the corresponding video clips is critical. This action ensures that the sound is accurately timed with the visual elements, which is essential for maintaining the flow and coherence of the project. The visual representation of audio waveforms allows editors to visually match the peaks and troughs of sound to the on-screen action, facilitating precise synchronization.

While adjusting audio volume or using the Audio Mixer can be part of the editing process, these tasks do not directly relate to the initial synchronization of audio and video. Similarly, changing the frame rate of the audio track is not typically necessary or recommended, as it can lead to further complications and mismatches in sync. Therefore, aligning audio waveforms with video clips stands out as the necessary action for achieving proper synchronization.