Metadata has become a very complex area because there are many different entities that store track information - the standard ID3 tags themselves and proprietary tags written by iTunes or Traktor, the iTunes Library or the Traktor Collection. So it can be confusing to work out which of these entities “override” the other.
For this reason we have decided to give the highest priority to the standard ID3 tags when available, because they are the most common denominator among all tagging applications. For information going beyond the standard, we rely on extended tags written by Traktor Pro into the files.
We decided for the latest ID3 version 2.4 for Traktor Pro so this should ideally be used.
Regarding MP4 files, the bit rate is not stored in a tag, it is retrieved by the decoder. The MP4 decoder in Traktor Pro has a bug where the bit rate is not calculated correctly. Because this decoder is licensed from a third party, we can't make any promises about when this bug will be fixed.
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