Audacity has tools to fade in and out. When you "fade in," it means to gradually increase the volume level from silence to the original level. When you "fade out," it means to gradually decreased the volume level from the original level to silence. Professional recordings of concerts often fade out after a song, while the audience applauds. Fading out avoids an abrupt stop at the end of the recording, because the volume level is decreased gradually to silence.

You generally fade in at the beginning of an audio segment, and fade out at the end of an audio segment. You can use Audacity to create special effects if you fade in or fade out in the middle of an audio segment. You can make a surprising effect by setting Audacity to fade in or out over a few second, then adding the opposite fade inside the first fade.

We created a long fade out in one of our tracks, so that the track is quieter. We then adjusted the spacing of the other tracks, moving them closer.