Hi,
I was trying to setup %replaygain_track_gain% in mp3 files and I found that it works using APE tags and ID3v2.4 (UTF8) but not when using id3v2.3 (UTF16), at least with VLC player.
Why is this happening? A problem with mp3tag saving the tag?
I've moved this to Support due to lack of feedback from @bob.knight Thanks to everyone else for confirming that everything works as expected.
I've also checked that ReplayGain metadata fields of ID3v2.3 tagged files using UTF-16 are correctly displayed in the Metadata tab of VLC's file information sheet.
I don't know if VLC shows somewhere in its UI when ReplayGain is applied, so I wasn't able to verify this.