For example, the Artist/Lyrics/Comments fields may contain data in Cyrillic. But in filtering conditions, it is impossible to enter such words; spaces are written instead of the text. And especially important – you can't specify the name of any Artist if it is written in Russian! PS. Oops, it turned out that filtering works, the Russian text fits in, but is not displayed in the interface – instead of letters, empty spaces. This seems to be a problem with the Traktor's System Font, not the Filtering Algorithm.