[Zubersoft]

The back button has never been set up to clear any active filters. If you tap on a group (artist, album, genre, key, etc) and then hit the back button, it will return to the first list, but the filters at the top of the screen have never operated that way. You can combine filters with searching groups and their songs, so I'm not sure it would be intuitive if the back button cleared the filters. I'm open to feedback though.