For MP3 files, emplode v2 will support a subset of ID3v2. In short, we've dropped id3lib -- it's not being actively maintained, and it does far more than we need it to.
As far as the contents of the *1files, we reserve the right to create new tags at will. However, the names will generally be stable -- i.e. title will continue to be called title.
The problem with writing only the ID3v1 tags is that they're limited to 30 characters. The contents of the *1 file are limited to 254 characters.
Roger - not necessarily speaking for empeg
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roger