Step 1. Find the .aup file that you want to convert to MP3. Step 2. Right-click on the AUP file, choose the Open with… option from the pop-up window, and open it with Audacity. Step 3. After loading the AUP file, you can continue to edit it as needed. Step 4. Then click on File in the menu bar and head to Export > Export as MP3. If you compress a song and it loses data, you can't uncompress it to retrieve the data. If you convert a song from a compressed to an uncompressed format, its quality doesn't improve. The file only takes up more disk space. An example is when you convert a song in MP3 format (a compressed format) to AIFF (an uncompressed format). Download for Free. Download for Free. Step 2. Add your M4A files. Locate the M4A files you want to convert and drag-and-drop them into the program’s window. The application can convert big batches of files – there’s no limit to how many files you can transfer at once. Step 3. Select MP3 as the output format. In the Formats menu, select Head to Zamzar website and click on the 'Add Files' button. Then you can process to import M4A files to it. Go to reset the output audio format as MP3 for your M4A audio tracks next to the 'Convert To' option. Press the 'Convert Now' button to start the conversion. When it is done, tap the 'Download' button to save the file to your PC. Video and audio file size can be up to 200M. You can use file analyzer to get source audio's detailed information such as track name, genre, bitrate and sampling rate. 2. Set target audio format, bitrate and sample rate. The target audio format can be WAV, WMA, MP3, OGG, AAC, AU, FLAC, M4A, MKA, AIFF, OPUS or RA. 3. Click the "Convert Now!" Of course, you can also convert M4A to MP3 without iTunes, thanks to many other freeware on the Internet that can also support converting M4A audios to MP3 well, such as Audacity, a free and open-source audio converter that can convert, edit and manage your M4A files easily. The following guide will show you how to use Audacity to convert M4A MP3 CDs: A specific type of data CD containing only MP3 audio files. All computers can play them as can some DVD and portable MP3 players. Noise Floor: A level or amplitude representing the amount of near-continuous background noise present in the signal. A background hiss would raise the noise floor, and could prevent a faint signal (one below 1. MiniTool Video Converter. The best way to free convert M4A audio files to MP3 format without any quality loss is by using MiniTool Video Converter. It is a 100% free and safe media converter designed for the Windows system. It supports a wide range of audio file formats – MP3, WAV, WMA, AAC, AIFF, OGG, M4A, AC3, M4B, M4R, and so on. STEP 2. Choose Apple Music to Convert. You can search for songs, albums, or playlists that you want to convert from Apple Music. Then, click the " Red Plus " button in the interface to fetch audio data. STEP 3. Convert Apple Music from M4A to MP3. After it's done fetching data from Apple Music, a window will pop up. Step 2. Navigate to the Files icon and select the '' Import Settings icon. Next, choose the '' MP3 Encoder'' as your Import Method and hit the ''OK'' icon. Step 3. In this phase, all you need to do is import the M4A file to iTunes. Select the ''Create MP3 Version'' after hitting the File and Convert options. batd.