Chord progression ear training

Recognizing a chord progression by ear is important for any musician. With this application you can practice recognizing more and more complex chord progressions.
The used chord types are:
- diatonic triads
- sus4
- sevenths
- 7su4
- secondary dominants
Fourteen levels are available. Each level introduces a new chord. The application generates randomly and according to the selected level a short chord progression.
The lite version (free) allows you to try the application with limited features. The "full version" button on the home screen unlocks all features by purchasing the full version.
ADVANTAGES OF THE FULL VERSION
- access to all levels. In the lite version, only four levels are available.
- ability to practice only with major or minor keys, or both (which is important because the same degree sounds different in a major or minor tone).
- possibility to display chords in absolute form (C, Dm etc.) or relative (roman numerals). In the lite version, chords are displayed only in absolute form. Relative displaying uses only roman numerals in upper case.
- possibility to modify the instrument and the tempo.
- Unlimited listening of each question (five plays only).
- possibility to reset the statistics.