The Settings - Audio - ID3 panel allows you to choose a default output format for ID3 based files. By default Yate will write ID3 v2.4 but the panel allows you to choose ID3 v2.3 on a per file type basis. This only affects mp3, aiff, dff, dsf and wav files.
The default output format can be modified in an action by the Modify Application Settings - Change Individual Setting Write ID3 v2.3 and Write ID3 v2.4 functions.
There may be times when you are working on different libraries of files and you want to use different output formats for each library. It may be a pain to modify the application settings or remember to use actions to save the files. For this reason Yate employs a means of overriding whatever settings are enabled (settings or actions). You can create a UDTI named YateID3v with a value of 2.3 or 2.4.
When saving an ID3 based audio file a test is made to check for the existence of the UDTI or custom field of the same name. If found and its value is 2.3 or 2.4, the valid will be used. If the UDTI (or custom field) does not exist or it has a different value, the settings will be used.
Note that this is a non standard tag and will be ignored by all other applications.