Find tracks NOT in a specific album from a folder of all tracks

find tracks NOT in a specific album from a folder of all tracks
Tried a filter but didn't work is there an action method thanks

How would you do that manually?

Check the biggest number of all existing tracks?
Count the number of existing tracks and compare it with the available highest tracknumber?

A filter could be
NOT %album% IS "specific album"

Filter is working but not doing what I want

If I open an album called test
I want to use a filter to see which of the tracks in test are not in another album called special

This doesn't work

NOT %album% IS "specific album"

I have problems thinking about a filter that compares the data from 2 different files to see if the data is the same in a particular field. MP3tag does not compare the data of 2 files.

If you want to get a set of files from one folder merged with a set of files from another folder, it may be worth a try to rename the files in the "test" folder to "test_%_filename%", move them to the "special" folder, remove the "test_" from the filename - and provided the files have the same name in "test" and "special", then renaming will fail for all the files that were in "special" before the merge.
You can then sort the files by name and all those with a leading "test_" can be moved back to the "test folder".

Used free file sync perfect for what I need, tracks I found in one album but in the other copied I er easily