I have not tried this out:
There is an action called "Import from Text-file"
It allows you to enter a filename that could consist of a variable, in your case %_filename%.
As target you have to specify a field - this would be "UNSYNCEDLYRICS".
Now: for other imports MP3tag expects a record to consist of a single line and the "end of paragraph" character is treated as end-of-record.
So it could be necessary that you replace the line-breaks in the text file with something else (like a #) first so that the whole lyrics become a single line.
You would then have to reconvert these # in MP3tag once you have imported the text.
Not sure what you mean. You can use the action that Dano described above and apply it to multiple files. That's your 'batch' processing. If you're asking how to select the files to apply the action to, then you may want to see if you can use a filter if you can't easily select them manually. I've never tried loading files into Mp3tag using a playlist; I'm not sure it's possible.
You said each lyrics text file has the same file name as the audio file. So look at the action described by Dano. %_filename% will be the file name of each music files (minus the extension), so they should match up 1:1. You would select multiple files in Mp3tag and apply the action. And the text imported into each audio file should be the text contained in the .txt file with the same base file name.
The syntax within the lyrics text files? That won't matter much to Mp3tag. It will import whatever is there.
EDIT: I've upgraded to 2.53
I used the Convert thing Tag -TAG, but the only thing that accomplished was to put the name of the textfile into the lyrics field, not the content of the textfile. That suggd.
Please tell me how easy it is to find the Import from text file Action
I'm bordering on the suicidal now.
I found this in the help for 2.48 and 2.53
Sadly, there's no Action called Import text file under the Action menu, just "case conversion", "standard", "cd-R"
So, how do i find or create that Action?
And believe me, I've looked.
And Convert | Text file - Tag" doesn't do it either, it gives me the wrong dialog box, not the picture Dano uploaded but something with "Filename:" and "Format string"