Create, trim, and combine audio files together for free online, using Kapwing. Overlap two audio files or link them together to make one long MP3 file. Kapwing works on any computer including both Mac and Windows PC, so you can merge audio anywhere directly from your web browser. With Kapwing’s MP3 merger and editor, you can edit and combine

In this clip, you'll learn how to use the Envelope Tool to automate the levels of your tracks within an Audacity session. Whether you're new to the Audacity DAW (digital audio workstation) or are simply looking to pick up a few new and useful tips and tricks, you're sure to be well served by this video tutorial. For more information, including step-by-step instructions, take a look.

Thanks for the reply. I have tried using the Time Shift tool to line them up right, but the tracks still don’t merge seamlessly, there’s still that pause separating them. Only online audio joiners like clideo seem to be able to do what I want. Would’ve thought this would be a simple task for Audacity.
Step 1: Open iTunes on your Mac, and then head to the "Songs" option to browse and select the MP3 files to be merged or press the Ctrl + Shift keys and click on all the required MP3 files; Step 2: Next, right-click on each of the MP3 files and followed by "Get Info" option.
This video shows how to combine multiple audio files (mp3) into a single file using audacity.
Here's a good explanation of these issues and method (two actually) to combine MP3 files and produce a "clean" final result with original metadata intact -- it's command-line so works on Mac/Linux/BSD etc. It uses: mp3cat to combine the MPEG data frames only into a continuous file, then; id3cp to copy all metadata over to the combined file, and
Crossfade. Option #4. Use the Envelope tool. Download Audacity. Option #1. Linear fades. The easiest way to create a fade within Audacity is to use the classic Fade In or Fade Out effect. These basic fades are also called Linear fades. They apply constant speed and amplification throughout the selected portion of audio.
Hey, let’s check out these 5 methods on how to merge tracks into one track in audacity. The first method is to simply cut and paste audio from one track to another. Choose the selection tool
Importing Sound. Select “File” > “Import” > “Audio.”. An “open file” dialog box will appear. Navigate to your audio file and choose “Open.”. Imported audio will be added to a new track. Most files, such as mp3 songs, import as a stereo track, meaning there will be two tracks in the window. This is what is supposed to happen.
Case 1: Applying a mono modulator to a mono carrier. This means that the modulator (voice) and carrier (music) initially are two separate Audacity mono audio tracks. If necessary, move the voice track directly above the music track. In the upper track (voice), open the Audio Track Dropdown Menu and choose "Make Stereo Track". Export Multiple will (as far as I can tell) split the tracks, but will export every track in my project. Export Selected Audio will export only those tracks which I have selected, but will combine them into one audio file. If they are raw recordings then maybe you could copy them from your hard drive, from wherever they reside. .
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  • how to combine audio tracks in audacity