Thank you for the suggestion on the split library but that is not what I am looking for. I share the info below for your convenience. Thanks in advance for your help & thoughts.
Windows 10 versie 1607 build 14393.222
Itunes 12.5.1.21
I pay 25 EUR/yr for iCloud Music Library (-all my music is stored in the Apple cloud-)
ANALYSIS LACIE FOLDER STRUCTURE
• The LACIE Y:\010_Music does NOT contain the full expected folder structure \Itunes\Itunes Media
It only contains a SUBSET of the expected subfolders Books, Mobile Applications, Movies and Music.
• Music contains 575 albums (42.25 GB)
ANALYSIS PC FOLDER STRUCTURE
• On "This Computer\Music\iTunes" (C:\Users\Wim\Favorites\Music\iTunes) I find the following
○ Folders: Album Artwork, iTtunes Media, Mobile Applications, Previous iTunes Libraries
○ Files: iTunes Library Extras.itdb, iTunes Library Genius.itdb, iTunes Library.itl, iTunes Music Library.xml
• The folder C:\...\iTunes\iTunes\Media\Music on the PC contains 48 folders (the most recent dates back to 2012) while the Lacie\010_Music\Music contains 334 folders
ANALYSIS iTunes SETTINGS
- iTunes Media Folder Location - \\LACINEMA_HD_\LaCie\010_Music
- Keep iTunes Media folder organized - enabled
- Copy Files to iTunes Media - enabled
- Share iTunes Library XML with other applications - enabled
MY OBJECTIVES
1. Make the IPAD playlists (and Genius mixes) available on the Sonos
2. I do not want a "split library portable". The entire Media folder (music, playlists, etc) must reside on the LACIE which will simplify making backups (and hence no Media items on the PC)
3. Both Sonos and Music app on the 3 Ipads must continue to work. [I do not know how Ipad Music app knows in which folder to look for music files on LACIE]
4. Only if necessary, create a complete new library (-by the book, according to iTunes standards in new folder on Y:\iTunes) and then (a) copy(-no move-) the music from the LACIE and (b) copy (? Import, consolidate?) the playlists from C-drive to that new library
5. If the implementation of the completely new library on Y:\iTunes would fail (regardless of the reason), then I want the current setup to continue to work
POTENTIAL APPROACHES
• Alternative 1: Create the missing parent structure Y:\010_Music. How do I do this?
○ Will this happen if apply the "Upgrade to Itunes Media Organization" and "Consolidate Library". Is this specific sequence the correct sequence?
○ What else is needed? In what sequence?
• Alternative 2: let iTunes create a completely new (empty/fresh) library on the LACIE (eg Y:\iTunes) (cfr Shift/Start/Create Library) and then
○ copy (-not move-) the Music content from old to new location.
§ Copy/paste directly from old to new Music folder
§ or from old Music folder to "automatically add to Itunes"
§ or ???
Thanks in advance for your help & thoughts.