Simply Tune funktioniert nicht

You can also customize the tone, volume and sound effect for you to keep the rhythm in a simple, modern, and professional interface. - Define the specific number of musical beats your song will play. - You can also choose the sound you prefer from 12 metronome sounds effects including human voice. - And many other functions to correctly play from the easiest to the most complex songs.  Practice the music you love, master your abilities in the instrument you prefer, and maintain the rhythm with the help of simple, yet professional tool for you to start playing the right notes with the correct tempo. -Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period.  Have high accuracy of musical rhythm and reproduce your favorite songs as a professional musician, with this simple and easy tool to train your music abilities with nothing but your passion for music, the instrument you adore, and the screen of your phone.  Used by musicians as a simulator to train the feeling of rhythm, Metronome App will help you when playing music on musical instruments such as: guitar, violin, drum, piano, synthesizer and others.  Metronome is a redefined way to receive accurate feedback of your daily practices with a simple visual representation of tempo rhythm, with strong and weak beats that includes BPM (Beats per Minute) tempo calculation.  You caturn of the auto-renew subscription from iPhone setting. -Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase.