A fade-in slowly increases the volume of a sound from silence to full volume. It is often used at the start of a track to make the beginning smooth instead of abrupt. This gradual introduction of audio can serve multiple purposes beyond simply avoiding jarring starts https://audiocutter.online/guides/fade-in-fade-out-crossfade/ For instance, it can build anticipation, drawing the listener into the soundscape or musical piece. It can also soften the impact of potentially harsh or dissonant sounds, making them more palatable.
Furthermore, fade-ins are commonly employed in sound design for film and video games to create a sense of atmosphere or to indicate a change in scene or perspective. The subtle increase in volume can subtly cue the audience to a new sonic environment, enhancing the overall immersive experience. In short, the fade-in is a versatile audio effect that contributes significantly to the professional polish of various audio productions.