I'm not shure but I think you need to download some kind of software to do it.
I used the link below. It works beautifully.
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here is one more free software you can try. i always use it:
m4a to mp3 http://m4atomp3converter.org/
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In order to convert an M4A file into an MP3, a special converting software must be used. One can either purchase a converter, or download one for free. CNET has one called "Free M4a to MP3 Converter."
The easiest way to convert your files to mp3 is to download a file converter off of the internet. I found a great converter at www.maniactools.com/soft/m4a-to-mp3-converter.
Did you try the software : MP4converter? It should work to convert your mp4 into mp3 music
There are many applications to covert an m4a file into an mp3 file; that don't cost a thing! Check out CNET download.com for a large list of free downloadable apps which are completely free of charge.
Most video converters can convert video to audio. The steps are similar. Simply add your .m4a files to the program, select .mp3 as the output format, and export the audio file. Free converters you can choose - VLC, Free HD Video Converter Factory, Convertio.
A good m4a to mp3 converter would be a free online download from the site maniac tools. You will be able to convert m4a to mp3 freely, and the free audio converter has received excellent reviews online.
Convert M4A to MP3 in iTunes1 Open iTunes. Go to the "iTunes" menu at the top of the screen and select "Preferences." A new window will open.2 Click "Import Settings" on the "General" tab in the preferences window.3 Select "MP3 Encoder" in the "Import Using" drop-down menu. Click "OK."4 Find the M4A song you want to convert to MP3 format, and highlight it.5 Go to the "Advanced" menu at the top of the screen and select "Create MP3 Version." The MP3 version of the song will appear in your music library.Convert M4A to MP3 or WMA Using a File Converter1 Open the file converter program or website. You can find a list of these in "Resources" below.2 Click "Add File" or "Choose File" and find the M4A file on your computer you want to convert. Click "OK."3 Select "M4A" or "Apple Lossless Audio File (.m4a)" in the "Input Format" drop-down menu if the program does not automatically detect the file's format.4 Select "MPEG-1/2 Audio Layer 3 (.mp3)" or "Windows Media Audio File (.wma)" in the "Output Format" or "Save File As" drop-down menu.5 Click "OK" to begin converting the file. You might have to agree to the program's terms and conditions first..6:YOU CAN FIND THE FILE ON THE COMPUTER EAILY BY CLICKING GETTING THE INFORMATION AND SEE THE PATH ,,ALL FILES ARE STORED IN ITUNE LIBRARY
Just Export as MIDI file.. Then, convert MIDI file to Mp3 file.
you can use total video converter software to convert any audio format to the required format... or you can use m4a to mp3 converter , it's a one click program , you can easily download it fromhttp://www.zippysoftwares.net/free-m4a-to-mp3-converter-download/
There are many softwares available that can convert Mpeg 4 to mp3Imtoo Convertorhttp:/www.imtoo.com/audio-encoder.htmlImTOO Audio Encoder gives you completed ways to convert audio files including MP4, MP3, WMA, WAV, M4A, AAC, OGG, APE, MP2, VQF. It is also an MP4 to MP3 and M4A to MP3 converter to convert MP4 to MP3 and M4A to MP3 with high quality. Jet Audio Convertorhttp://download.cnet.com/JetAudio-Basic/3000-2141_4-10013740.htmlJetaudio not only play vidoe and audio files but it can also edit/convert audio and media files for you.
I will use media converter to convert Windows WMA/WMV files to iTunes supported file formats like MP4, M4P, M4A, MP3.
you need to remove iTunes DRM protection, convert iTunes M4A M4B AAV songs to MP3 and then you can transfer to MP3 Player.