[Zubersoft]

Okay, thanks for the clarification. I do plan on adding a "fix path" type utility to the Windows 10 version, but it will be limited to folders under the storage location, as that is all the app is granted access to. 

So if I do add the option to filter only on songs belonging to certain collections or setlists, I think the merge would have to be confined to merging songs in that list that exist on both tablets, and adding songs that exist on the server over  to the client. The filter would only apply to what exists on the server device, so that would cause other songs on the client device that might not exist on the server to be ignored. Is that basically what you want? When merging groups (collections, setlists, genres) between the two devices, how am I then supposed to handle songs that only exist on one device but were ignored because of the filter? Should I add blank songs on the target device? Should I not allow groups to be merged when filtering songs like that? Should I only merge groups where they both contain only songs in that filtered list?  Already I can see this making things much messier.

Thanks,
Mike