Also, considering the user might want it to be a script, maybe a short story outline. Should I structure it with acts? Introduction of the protagonist, discovery of the device, mission to the past, climax, resolution. Add some action sequences where the dual audio is necessary, maybe a heist-style setup in the past.
I should make sure the story is engaging, has a clear hero's journey, and uses the dual audio concept as a central plot element. Maybe the antagonist is someone using ancient tech in the wrong way, or a rival time-traveler.
Subtitle: "Dual Audio – Echoes of the Past"