Instagram Reels offers users the opportunity to add audio to their fun and creative videos, including the option to mix original audio with music or tracks created by another user. Creators can also add an effect or filter, or change the speed of playback. Here’s how those interested in making their own Reels can easily mix audio they’ve created with audio already available through the Instagram app. .
Link: How To Mix Audio On Instagram Reels Using The Android & iOS Apps