What the other poster is describing is more commonly called "ducking". https://en.wikipedia.org/wiki/Ducking https://en.wikipedia.org/wiki/Ducking The secondar

What the other poster is describing is more commonly called "ducking". https://en.wikipedia.org/wiki/Ducking https://en.wikipedia.org/wiki/Ducking The secondary audio (background music) automatically lowers when the primary audio (narration) is active. It allows the narrator to talk over the background music without being muffled by the music. An automated way to do this is in audio production is by using the sidechain input of a dynamic range compressor. https://en.wikipedia.org/wiki/Dynamic_range_compression#Side-chaining https://en.wikipedia.org/wiki/Dynamic_range_compression#Side...