I am delighted with the USB library features in the wiim amp. In fact that feature alone is justification for buying the wiim amp as I have large libraries of music and audiobook files. However there are two simple features which would be of great benefit to keeping the USB library up to date. First, using the wiim home app, the ability to add files directly to the library from, say, an iPad or iPhone download folder. Second, the ability to delete tracks/albums from the library also would be useful.