It works. I use it myself.
The problem is most probably the behaviour of Mp3tag with multivalue tag. I guess you get outputs like "cat01\\cat02"?
That's all a script can do, as for some technical reasons which I don't fully understand, Mp3tag is not able to write a multivalue tag field with a web sources script.
There are two quick ways, to transform "cat01\\cat02" into a correct multivalue field:
a. (the method which I used until recently):
Press Ctrl + S after running the script. That additional saving process transforms "\\" into a multivalue seperator.
You have to display the all fields with mulitvalue tags in the tag panel to transform.
And you have to do it for every album seperatly. I works only if all files have the same values in tag fields which should become multivalue fields.
b. (the method which I use now):
Make an action group that seperates your fields:
Action: Split field by seperator
Field: CATALOG #
Seperator: \\
You can combine more actions (one for every tag field) into one action group. I my group, there are three actions, for the fields: GENRE, PUBLISHER and CATALOG #.
That method has the advantage, that you don't have to display all fields in the tag panel, and you can process that for different albums in one go, as it doesn't matter here if the fields have the same values or not.
If you use the "&" character in for a action group's name, you can make it controllable via keyboard short cuts.
You can copy the value of one field to another. But that writes the same value into both fields, no matter if multivalue or not. To do so use:
DISCOGS~PONE COPY 1 SOURCE = catalog #
DISCOGS~PONE COPY 1 TARGET = Album_ID
If you want to get a modded value of one field into another or more fields, you would have to use the TEXT OPTION: FREE WEB SOURCES SCRIPT CODE FOR ... SCRIPTS fields. But those need some knowledge of Mp3tag's web sources script syntax.
so many smilies from mr hofmann, that will give me interstings dreams tonight 