The Octavian Pro App

Today's app is the Octavian Pro app:

​Octavian Pro (http://www.bitnotic.com/octavian.html) Music theory app featuring over 550 scales and over 100 chords with options for viewing, listening, and cross-referencing; reference, learning, and teaching tool for all musicians, students, composers, and songwriters; includes scales from around the world and through history; view any scale with any root note, in any mode, and examine the chords and harmony within the scale; chords including sevenths, elevenths, ninths, thirteenths; invert chords and browse scales that include the chord; compose twelve-step chord progressions with inversions, transposition, and added sevenths for each step; enter notes on the keyboard to find the scales and chords that contain the notes; configure the note labels to show notes, intervals, degrees, steps, or solfège; choose tempo, octave, and repeat options for the piano sounds to suit ear training, practice, or for hearing new harmonies; PDF user manual and video available at website; (iOS 4.3 or later).