This app works. I'm currently listening to an otherwise untouchable music file courtesy of mpc2aiff. It sounds great! The app worked fast and easy. The instructions make it look complicated...ignore them. Just download, open the folder, drag the app to "applications", open it, drag the .mpc files into the drop box, select the quality setting, hit go. Bingo, bango, and a couple of min.s, and you're done.