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!"
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The tool allows you to quickly change the key of any audio recording, as well as speed up or slow it down. This can be useful if the backing track is too high or too low for your voice. If you need to change speed of your sound file online, then our editor is what you need. You can easily do whatever you need and all this is absolutely free.
My understanding is that they are not different, just different extensions for the same MP4 container format. Extensions like mp4, m4v, m4a and m4b are only meant to differentiate the content in the MP4 container: video and audio for mp4, only video for m4v, only audio for m4a, and audio meant to be consumed as audiobook for m4b.

Best way to convert your M4A to M4R file in seconds. 100% free, secure and easy to use! Convertio — advanced online tool that solving any problems with any files.

Locate and click Edit in the menu bar, and select Preferences. On the General tab, click Import Settings. On the Import Settings window, for the Import Using option, select MP3 Encoder from the drop-down, then click OK. Now select the M4A audio file, go to File, then choose Convert, then select Create MP3 Version.
I would avoid converting to mp3 because you would be converting from one lossy format to another lossy format and might lose some frequencies here and there. I say lossy to lossy because mp3 is definately lossy, and as a container m4a might be storing AAC (lossy) or ALAC(lossless) depending on how the audio program it came from handles things. P8c9.
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  • can audacity convert m4a to mp3