Fade-in sound effects add a professional touch to your soundtrack, but audio editing often involves using complex software. Luckily, your smartphone and a few simple apps make fading sounds easy.
WaveEditor is a versatile audio editing app for Android users that offers a variety of editing features, including the ability to apply Fade In and Fade Out effects. WaveEditor supports many different audio formats and allows precise control of fade effects. This is a great choice if you want something simple but effective.
After launching WaveEditor, import your audio file by clicking the button Browse and select that file from your phone. Next, tap on options Macros and choose Fade In for the beginning or Fade Out for the last part. You can adjust the duration of the effect using the slider overlaid on the waveform. After applying the fade, preview to make sure the audio sounds right, then save the edited file.

GarageBand is Apple's flagship music creation and editing app and is perfect for users who want more control over their audio projects. GarageBand is one of the best free music production software, but is also great for small edits like applying fades.
To add a fade effect, open GarageBand and create a new project by selecting the option Audio Recorder or Trackdepending on the type of source you want to use. Then, import your audio file by clicking the mark + or drag the file into the workspace.

If you're looking for a less complicated but still effective GarageBand alternative, Audio Editor Tool is a great choice for iPhone users. This app simplifies the audio editing process, making it easy to apply Fade In and Fade Out effects in just a few steps.
Open the application and launch the Audio Editor Tool, then load your audio file by clicking the button Open. Click on the track and you'll see a number of options, including symbols Fade In and Fade Out.

Lexis Audio Editor is another highly functional Android app that offers a rich feature set for audio editing. The app supports multiple formats, including WAV, M4A, AAC, FLAC, and WMA, and allows for a variety of adjustments, including the ability to fade audio.
Launch Lexis Audio Editor and import your audio file by selecting Open. Navigate to the waveform part of the track where you want the fade effect. You can zoom in for more precise editing. Go to the menu Effects and choose Fade In or Fade Out depending on need. Lexis Audio Editor also allows you to adjust the length of the fade to suit your needs by adjusting the slider.

5. BandLab for iPhone and Android
BandLab is a comprehensive music creation platform and also a social network for musicians. The platform integrates a variety of music composition, editing, and collaboration tools.
Open BandLab and start a new project by selecting Import File. Select the track you want to edit, then tap the track on the waveform, then tap the three white dots and find the option fade. fade. Use the slider to add a fade effect to the track.

- Get BandLab for Android and iOS (Free, in-app purchases available)
Choose the app that works best for you and enjoy adding smooth transitions to your audio projects without the need for complicated PC software.