The app aims to be a study tool for hikers of all the levels. HARPSCALES acts as a Dictionary of Scales in the Diatonic Harmonica to facilitate the study throughout the texture of all tones. Using the App you can check which position will be most easily played to desired scale giving all the possible options for its execution for those who use bends overdraws overblows or even for those still learning to isolate breathed and aspirated notes. The PRO version has 2160 scale layouts for you to study !!! Enjoy the launch price of 19.99!