Fill in the info and click the "Save Metadata" button. Or you can use the free VLC player > Window > Media Information. Most DAWs can do this easily and allow you to add metadata for the mp3. If you want to then turn the WAV file into an MP3, there's lots of ways to do this. So Audacity is pristine, no phase alterations or spectral alterations.
HOW TO EDIT MP3 FILES ON MAC FULL
I then took the original WAV and WAV exported with metadata back into protools, inverted the phase of one of the WAVs and there was perfect cancellation at full volume on my sound system. Then imported into Audacity, added metadata, and exported as a WAV file with the same parameters. Bounced down a mix to a 16 bit 44.1khz WAV file. You might think that using a free app like Audacity will give you inferior audio quality if you rebounce the original WAV file after adding the metadata, but NO, it is a perfect copy of the original. Note: This also works with AIFF files !! But make sure the project settings for Audacity are 16 bits and 44.1khz, otherwise it will resample the audio and you'll get artifacts from that. Then fill in the form with all the metadata you want to include and export the WAV file as a 16 bit WAV file (CD quality). Just drag your rendered 16 bit 44.1khz WAV file into Audacity > Edit > Metadata What worked for me and is free and very easy to use is Audacity. Logic Pro X only allows you to add metadata to MP3s, same as Pro Tools.
Same with VLC player, which I tried as well, it didn't work even though playing the file in VLC player kept the metadata set using VLC player. If you send the file to a PC or Smart TV the metadata doesn't stick.
iTunes is useless for adding metadata to WAV or AIFF files, because it only sticks to the file inside iTunes. I've read lots of blogs where people give advice on adding metadata to WAV files.
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