In digital audio production, a crossfade is editing that makes a smooth transition between two audio files. Crossfading became easier to achieve with the invention of the computer-based digital audio editor. The main objective of a crossfade is to make a smooth transition between two sections of audio.
The two sections overlap and as one section fades out the other fades in. DJ’s mostly use this type of technique, for “compilation” tracks and mashups. Crossfade is also used for editing speech recordings, extending songs, creating loops for audio sequencers, repairing damaged recordings and much more.
How to crossfade two tracks using Audacity?
To cross two tracks, first, the tracks should be recorded or imported. By this, both of the audio files are going to create two audio tracks one above the other.
If you want to crossfade many songs that are currently one after the other in a single audio track then before going for the crossfade following the methods mentioned in this article you must select the first song, use Edit > Clip Boundaries > Split New to move that song to its own separate track, then select and Split New the other songs.
1. Roughly position the tracks
By using the Time Shift tool you can drop the second track at any place. You don’t have to worry about the position of the track at this stage.
There should be an overlap of at least 5 seconds for cross-fading 2 music tracks. But it generally depends on your music taste that how long you want the crossfade transition.
2. Align tracks more precisely
Tracks are often going to start and finish with a small period of silence. You can remove the leading silence by selecting and deleting. You can use the Audacity’s Cut Preview to see that the selection to be deleted is correct.
The point at which first track stops will be the end point of the first track. The start of the second track will be the point at which the second track starts to fade in.
When the region which is going to be crossfaded is selected, you have to create a split at both ends of the selection by using Ctrl + I.
3. Trim the tracks
It is need of the tracks to be trimmed further, you have to select the unwanted region after the fade out and then delete it.
To delete the audio before the fade-in you have to use Edit> Remove Special > Split Delete, so that the remaining part of the track won’t move.
4. Apply fades
The fastest way to apply the fades is with the Crossfade Tracks effect. A fade-in is going to be applied to the lower of the two tracks and fade-out to the upper selected track.
If you want to apply more complex fading, the Adjustable Fade effect can be applied to each of the tracks, in turn, applying a fade-in to the overlapping section of the second track and a fade-out to the overlapping section in the first track.