Challenge 1: Ducking Music During Narration — Solution Walkthrough

The fitting concept:

Fader automation.

Why, per this chapter's own material:

Fader automation lets volume change smoothly over time rather than
staying at a single fixed level — this chapter names ducking
background music under narration directly as the example this
feature is used for. Setting a single fixed volume for the entire
track couldn't achieve lowering the music specifically during
narration and raising it again afterward; automation is what allows
that volume to change dynamically at specific points along the
timeline.

Why a simple fixed track volume wouldn't work:

A single fixed volume level applies uniformly across the whole track
— there's no way to make it quieter during one specific segment and
louder during another without some mechanism for the level itself to
change over time, which is exactly what fader automation provides.

WHY THIS WORKS AS AN ANSWER
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This exercise is a direct, practical application of this chapter's own
fader automation example to the exact scenario the chapter uses to
illustrate it.