Check the Fade in and Fade out boxes to apply smooth fade effects to the beginning and end of your audio file, respectively.

After launching WaveEditor, import your audio file by tapping the Browse button and selecting it from your phone.Next, tap on ...

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Locate the audio clip in the timeline that you want to fade. Focus the timeline view on the left or right end of the clip for a fade in or a fade out, respectively.

Step 8: There’s more than one way to apply a fade in Audacity. One way is to select the audio region you want to fade (you can ‘spill’ your selection earlier or later if you want to, don’t worry), ...

Click the "Clip" button, select "Audio" from the menu and click "Fade In" or "Fade Out" to add the Fade In or Fade Out effect. Press "Ctrl-U" to open the Audio Clip Volume window.