DJ Setup

Hardware and Software
WIP
Categorising Music
Separate DJ Music from your other music by moving it into a new location, ie DJ Music. Within that create a folder XXXX Added where XXXX is the year purchased, to separate music by time purchased. This is helpful when playing more recent music more often.
Traktor can READ (not write) the iTunes Library XML file. Traktor ratings and metadata changes do not cross over into iTunes. This file can be provided by any application:
Changes made in Traktor do not carry over into the library provider.
iTunes is suitable, with limitations:
iTunes ratings and metadata changes do not cross over into Traktor.
iTunes cannot create smart playlists based on path information, unless Sundry Info to Comments is used.
These changes do not save into the file metadata.
iTunes is not available on macOS Mojave.
Beatport Pro is unsuitable:
Can not create Smart Playlists based on Paths (no workaround).
Syncing songs to be Beatport is done on a per song selection basis, unsuitable for bulk syncing.
Syncing does not update Year of release, so can't add Smart Playlists based on that.
Repopulating the library removes the files from dated Downloads Playlists.
This makes it unsuitable.
Swansian is unsuitable:
Swansian has no native export.
Swinsian2itlxm, which exports to iTunes Library XML does not export smart playlists (such as files with a path containing 2019 Added) (no plans)