This can easily be done using the Crossfade Tracks effect in Audacity. Add a new stereo track. Paste the second audio song or clip into the new stereo track so you end up with song / audio clip 1 on track 1 and song / audio clip 2 on track 2. Select the sections of both tracks where they overlap and choose Effect > Crossfade Tracks.

Part 3. Join MP3 Files on Windows 10 - Audacity. Standing out as an open-source and multi-track audio editing software, Audacity is undoubtedly worth a try while you need to merge MP3 files in Windows 10. It's freeware requiring no paid license. With it, you are empowered the ability to combine, cut, and edit your MP3 audios. In this video tutorial, I show you how simple it is to overlap audio track files with each other, in audacity, so that they can be heard & played simultaneou

Select the audio track section you want to keep and go to the Edit menu, then Remove Special (or Clip Boundaries, depending on the version) > Trim Audio. The shortcut for Trim is Ctrl + T. Trim will remove everything from the audio track except for your selection and leave a single audio clip. Step 5.

Highlight the space in-between these tracks. Go up to "Generate" in the top menu and click "silence" Et Voila You can click on the little black line where the tracks meet to merge the tracks if you like.
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how to merge audio tracks in audacity