Hello, someone could tell me the name of the field that I would have to locate in mp3tag to link it with AIMP?
Tag i want to link is CATALOG on AIMP, i have tried %catalogid% & %catalog number% but not found
You can press ALT + T (Menu: View -> Extended Tags) in Mp3tag on a song including your AIMP link and see the field name with the matching content.
Thank you, you have solved it for me
Do you mind to let us know the correct field name? 
%COMMENT CATALOG NUMBER% its the correct field name!