Clear Wave funktioniert nicht

App can turn your phone into a professional sound level meter, precisely measures the sound pressure level all around you, detects harmful environmental noises, and helps to protect your hearing.  Tone generation is needed for checking acoustics, testing hearing, tuning of musical instruments, science experiments, testing sound equipment, etc.  The subscription will automatically renew unless turned off in your iTunes Account settings at least 24 hours before the current period ends.  Clear Wave - Speaker app lets you create pure wave tones at frequencies from 50 Hertz to 30. 000 Hertz and track environmental noise around you.  You can go to your iTunes Account settings to manage your subscription and turn off auto-renew.  Take photos from the camera with the overlay of information about the noise level, time and date.  Pricing in other countries may vary and actual charges may be converted to your local currency depending on the country of residence.  Simply swipe your finger on the controller clockwise or counterclockwise to raise or lower the tone frequency.  Your iTunes Account will be charged when the purchase is confirmed.  Control the volume, frequency and waveform in the real time.  Great variety of waveforms: Sine, Square, Triangle, Saw Up, Saw Down.  This price is for United States customers.  If you subscribe before your free trial ends, the rest of your free trial period will be forfeited as soon as your purchase is confirmed.