Piano... funktioniert nicht

You may adjust the volume of the background music and the diese App keys separately to get the balance just the way you like it.  The keys light up in rhythm with the song so you will always know which note to play.  You may unlock all songs and remove advertisements using In-App Purchase. diese App App Terms of Use: App-app-terms-of-use.  The music staff is highlighted and displays the note name as you play.  Scroll the keyboard left or right using the area just above the keys when a song is not playing.  Musical arrangements are based on traditional folk and classical melodies presented in variety of styles. diese App... is ad-supported.  Tap to play 50 songs with background music.  Use the Tempo Switch in the settings to select the speed and play along with full accompaniment.  Want the background music to play more softly?  Welcome to diese App... an interactive diese App with animated songs.  Add note names to the keys if desired.  Adjust song volume in Settings.  Includes five octaves of keys.  Improved key responsiveness and song animation.  Select fast or slow tempo.