Mixing and layering audio are audio editing techniques that can help you create a balanced and harmonious sound for your media project. You can use mixing and layering audio to create a nostalgic or sentimental media project by adjusting the levels, panning, and equalization of your audio tracks, and by adding or removing background sounds, sound effects, or voice-overs. For example, if you want to create a nostalgic project that evokes a specific place or time, you might mix and layer audio tracks that include ambient sounds, such as traffic, birds, or rain, or sound effects, such as bells, phones, or sirens, that match your setting or period. If you want to create a sentimental project that emphasizes a personal story or message, you might mix and layer audio tracks that include voice-overs, such as narration, dialogue, or quotes, that convey your point of view or perspective.