I have a huge library of FLAC and MP3 files and have started looking at adding a tag for Dynamic Range.
The easiest tool that I have found so far is a Foobar addin that calculates the Dynamic Range and saves it in a tag, but it also rewrites the Modified timestamp.
Like some others I depend on the Modified timestamp to indicate the acquisition sequence of music.
So, I wrote an MP3Tag Action to Format value "FILE_MOD_DT : %_file_mod_datetime% to save the original Modified Date and Time. This allows me to restore the Timestamp manually using BulkFileChanger.
Florian has stated categorically that MP3Tag will not custom modify the timestamps, don't ask. So reversing my action doesn't work in MP3Tag.
So, my question is does anyone know a way of mimicking an Action to read a user defined tag (FILE_MOD_DT) and write it to the Modified timestamp on FLAC or MP3 files.