I'm using iTunes 12.8 with Yate by 2manyrobots (https://2manyrobots.com/yate/) to manage metadata for a library of approx 50k AIFF tracks.
Yate has the ability to retrieve data from Discogs and write to ID3 tags - in doing so it writes the unique Discogs Release ID to a User Defined Text field.
What I want to do is create a live updating smart playlist in iTunes that can tell me which tracks do not have a Discogs Release ID so that I can process them, but obviously I cannot set User Defined Text fields as a condition on the smart playlist.
Is there any way around this? Perhaps using an AppleScript that I can run periodically which can inspect the metadata and create a playlist..?