Went through the forum for almost an hour and did find many suggestions regarding how to use filename - tag conversions...which also made me think if my question is a bit stupid
if the pattern of underscores is common to the files, then, in conjunction with %dummy% you will get the result, I bet.
To me the pattern looks like:
%creation_date%%dummy%%dummy%__%artist%-all
As there is a preview in the Convert>Filename-Tag dialogue you will be able to easily adapt the number of underscores and other text elements (like -all) to get the right data.
Thank you for replying and giving me a hope that it can be done. The file name is uniform throughout the direcotry...but the MP3tag is not allowing me to execute the syntax. The OK button is greyed out (picbelow) but the Ok button is highlighted if i enter only one string eg %creation_date% and the tag is changed below screenshot
For automation you can use the action of the type "Guess values" (import tag fields):
Use _FILENAME as source
Enter that string as guessing pattern that you have used for the converter.
