I currently have my large, complete physical music collection imported in iTunes in wave format. Within iTunes, on album level (showing albums), all cds are presented the correct way in the correct layout (except for album covers), which is great for having the base collection within iTunes. But on track level I only made rough amendments, knowing that the standard import function of iTunes tracknames etc. are commonly not checked and often incorrect.
As for Rekordbox only the info & tags of the tracks are essential (not the albums), and I am aware that the info within iTunes is not complete/has many failures in writing the titles, artists, etc. Therefore I recently tested the mp3tag program (connecting to discogs) to make amendments within iTunes. As far as I can see, false track info have not been amended within iTunes, although the files themselves have been amended for the filename and all tags as well.
Is it possible to use mp3tag program to amend the metadata within iTunes at all (as this is a very large collection). And if so, how should I do this?
The problem is that iTunes apparently saves any metadata only in its database but does not read any data from the files.
So the only way around it would be to switch to a format that iTunes supports like FLAC.
As I said: it is an iTunes problem that iTunes has to overcome (here: lack of wav support). Tagging usually does not add features to programs.
There is no way to manual make changes to the iTunes library file externally. Like all things Apple, this is a closed environment.
Honestly there is very little benefit in my opinion staying with wav as a format. Given the list of programs you are using, I would recommend you consider converting to ALAC (Apple lossless) as it may save you some file space, but more importantly has full tag support. As I mentioned previously, there is very little support for the wav format in this regard, especially in iTunes (no FLAC support in iTunes). You may have your reasons, but if you choose to stay with wav you will be limited by what it can do. There are plenty of converters out there, some better than others - be aware of what "free" software my cost you in the end.
Personally I have both iOS and Android portable devices, as well as several AppleTV boxes throughout the house. So I continue to use iTunes on my home server to support these devices. I switched from mp3 to ALAC over 10 years ago and have no issues with compatibility anywhere.
Yes, that is the assumption. I just read that he wanted iTunes to read the modified tags. Anyway the best option is as mentioned by other users above, to use ALAC if he wants to have lossless audio and use iTunes.