When referencing audio levels, which specific feature is important in Storyboard Pro?

In Storyboard Pro, the audio track mixer is a critical feature for managing audio levels effectively. It allows users to adjust the volume of different audio tracks individually, providing control over the overall sound mix. This is essential for ensuring balanced audio, where dialogue, sound effects, and background music can be heard clearly without overpowering one another.

The audio track mixer also offers visual feedback through level meters, enabling users to see if any tracks are clipping or if adjustments are needed to maintain a clean audio output. This feature is integral to the storytelling process since audio quality can significantly impact the viewer's experience.

While the other options, such as the audio editor and sound board, play roles in working with audio, they do not provide the same level of control for mixing and balancing multiple audio tracks as the audio track mixer does. Volume control is a more basic feature that may adjust levels but lacks the comprehensive functionality necessary for professional audio mixing found in the mixer.