I have 579 of my 7050 classical albums not identified. Some will never be identified because they were private issues and other such. Before adding a new album, I always “fix” the metadata to my own standards. After adding the album I check if Roon identified it. If not, then I try to do it manually. I also usually split long “albums” into logical albums of 60 to 90 minutes because that’s how I like to choose them for listening. Roon has fits with these and doesn’t give me much help with matching up the tracks, something I would like Roon to do something about. (Yes, I’ve submitted a ticket.)
For manual identification, the right one often pops up right in the initial suggestions, but Roon didn’t choose it for some reason. Those are the easiest. If I have to go into the “None of these look right” area, then it can get dicey. Sometimes I get lucky and find a match right away toward the very end of that list. More often I have to adjust the search criteria. I have the best luck with erasing the content of both top boxes and putting in the most prominent words on the album cover. If that doesn’t work, I try searching for just the artist, or just a few keywords for the album name. Fewer words are best. Roon has some annoying habits: putting the same suggestions at the top of the list as the initial ones (that I already said didn’t match), not giving me nice options like “starts with”, inundating me with matches on single words like “symphony” from any composer that are irrelevant, and some infernal limit on number of hits (where I’m sure if I could see just a few more, I’d find it). Even so, I have pretty good luck on average.
I hope you find this helpful.