One star because I have been waiting for an update for a year. I love this app. But I am not motivated to use it much. It could be so much more. How about levels and progress charts and achievement records? How about a visual map to show progress like on some of the addicting iPad games? What makes Candy crush so addicting? Its the levels and visual sense of progress.
Also, this app has so much more potential... Chord inversions, chord progressions, relative pitch, perfect pitch, key/chord relationships, instrument (timbre) recognition, texture identification.... Add some of these ideas and make it fun / addicting to play and youll be my favorite app.
Awaiting fix about Music Theory Pro