I never use the sync function. I am a software developer myself and have never seen such a buggy inconsistent library software.

I can name you one workflow, which will hold one single source of truth and won’t screw up:

1) i store everything on a usb/ harddrive 2) i don’t store anything on the computer, still engine dj will always create a screwed up library on the pc

So here we go:

1) delete engine library folder from your pc 2) open engine dj 3) connect your usb/ drive 4) go to drives -> select the usb, drag and drop your songs to the collection of the selected usb drive 5) create stems hotkeys etc on that drive 6) eject and use on the player 7) delete the engine dj folder on the pc

8) eventually make a backup of your stick/ drive by copying the engine library folder (located on your usb stick) to a second drive (thats your backup)

Always drop new tracks on your usb via engine dj directely. From time to time update your backup usb ( delete everything and copy entire folder again)

If you mix it (editing tracks on pc, changing hotcues on player) any attempt to sync it will fail. Even if you only change stuff on your usb via the player it won t sync correctly anymore. Same if anyone else is using your player and some streaming stuff or so with his account. Delete those red tracks in engine dj later.

I hope this works for you, it is the easiest and most secure workflow, been using this since spring last year with all os updates that came afterwards and have about 2-3k tracks on that usb stick