Hello! I'm struggling to make a full automation of changes in my fields. I want to create an Action that converts Filename into Tag. I know I can do it manually in the converter, but I wanted to make it using Actions.
Eg. 100 - File.mp3
Track: 100
Also, I'd like to fill blank Genres with a specific word, like "Unknown". I tried to create a regular expression, but I'm not able to leave the field blank.
Thanks!
The action equivalent for the convert functions is an action of the type "Guess value" for
Source: %_FILENAME%
Guessing pattern: %track% - %dummy%
To fill genres with "unknown", use an action of the type "Format value" for GENRE
Format String: Unknown
Thanks for the help!
I just need some changes now. I wanted that the track could be in the format "77", when the filename is 077. How could I do it?
And about the Genre doubt, I'll try to explain again. I want to select all tracks at once and play that action. Some of the tracks have empty Genres, and I would like to replace empty blank spaces with the word "Unknown". Can I do it?
If you are willing to help me with this one last question:
I also want to replace the value of COPYRIGHT with the same COPYRIGHT value, with the marker "℗ " before. How can I do that? Thank you in advance!
Action "FOrmat value" for track
Format string: $num(%track%,1)
Format value for GENRE
Format string: $if2(%genre%,unknown)
see faqs: /t/967/1
Thank you! But the second code did not work, it did not filled empty genres with the word Unknown. Could you please check that?
I can't at the moment - I would try
$if2(%genre%,'unknown')
Didn't work either.. 
This is a little astounding - I found a thread with a very similar problem and a very similar solution:
/t/19099/1
Are you sure that you used $if2() and not just $if()?
Yes, I'm sure. The thing is that the funcion compares if it exists, while it shoud return Y, if X doesn't exist, which is, return Unknown if %genre% doesn't exist..
Oh, I see.
so perhaps
$if($eql(%genre%,),Unknown,%genre%)
It didn't work. I tried $if($eql(%genre%,),'Unknown',%genre%), but no success. 
I don't know what you are doing because I just tested it and both work:
if2(%genre%,'unknown') -> no genre = "unknown" otherwise the genre string e.g. "Blues"
$if($eql(%genre%,),'Unknown',%genre%) -> same here
So: where and how do you apply the expressions?
I understood what's happening. I tried the function isolated, and it worked. But it didn't work among other functions in a single Action. I've uploaded my actions. Do you know why?
What I notice is that you replace text constants like "Brasilianische Musik;" with the pattern matching replace with regular expression although you do not use a regular expression. A simple replace would be enough.
What I would try: move the new action upwards in the order and see whether it works.
Thank you! You're a genius. Worked like a charm.