Is it possible in the Tag Panel in mp3tag to auto-fill the discnumber as 1 and pull the Album Artist info from the Artist field?
No, that would be a job to do using Mp3tag actions. You need two Format Value actions.
Action type: Format value
Field: DISCNUMBER
Format string: 1
Action type: Format value
Field: ALBUM ARTIST
Format string: %artist%
Either place these in separate action groups, or into a single group if you want to more easily execute them both at the same time.
It's ALBUMARTIST (without the blank).
Thanks all.
I prefer ALBUMARTIST without the blank, but if he wants 'ALBUM ARTIST' with a blank, that's how it's done.