Bando-App is a tool designed to assist bandoneón students in locating the position of each note. Simply tap the note on the staff, and the corresponding key will light up. If you need to view the location of multiple notes simultaneously, you can activate the "chord mode." Additionally, there is an option to play the sound of the note both when tapping on the staff and directly on the key.You can choose from three models: 33/38 (Argentine tango), Péguri 33/40, and Einheits 144 (35/37)Key sizes and interface colors are customizable to adapt to different screen sizes and lighting conditions.So far, Bando-App has been translated into English, Spanish, German, Italian, and French