[Zubersoft]

One thing you can do is set up the sync to be one-way and then change the merge behavior to only merge new songs and groups. That will avoid checking for updated songs and will only process new additions to the library and any changes to the groups. I think this is basically what you are asking for, but let me know if that differs in some way from what you are looking for. Don't forget that if you want to use a basic file synchronization approach, you can also synchronize the database file between devices. On Android, you just need to enable Settings->Storage->Expose Database. On Windows, you would just have to synchronize the C:\Users\<your username>\AppData\Local\Packages\41730Zubersoft.MobileSheets_ys1c8ct2g6ypr\LocalState folder between devices.

Mike