I wasnt able to use this app for the longest time (because I updated to a newer version of iOS, I think), but I finally got Dirac HD Player working again by uninstalling the app, installing it again and then restarting my iPhone. In regards to the apps performance, I have some minor complaints and suggestions. When using Apple In-Ear Headphones (i.e. ADDIEM), turning on Dirac HD Sound cuts out some detail. Maybe Diracs in-ear setting is for Apples older single driver in-ear headphones, though. Also, the app doesnt have gapless playback support. Songs available for download through iCloud are displayed, but Id like a way to hide them to see only the music stored on my iPhone. Id also like a way to find my music by first specifying the genre.