Which icon is clicked to turn on the waveforms in AVID Media Composer?

The waveform icon is specifically designed to display audio waveforms within AVID Media Composer. When editing audio, visualizing the waveforms allows editors to more accurately assess audio levels, see peaks and troughs, and make precise adjustments to timing and volume. This visualization is crucial for synchronizing audio with video as well and understanding the dynamics of the sound being manipulated. The other icons serve different purposes; for instance, the play icon is used for playback, the record icon is for recording new audio or video, and the mute icon is utilized to silence audio tracks. Hence, the waveform icon is the correct choice for enabling waveform visualization.