Pocket Pitch funktioniert nicht

Pocket Pitch is a simple tool for singers who need to be able to quickly identify or play notes.  It uses professionally recorded sound so that the audio experience is just like carrying around a pitch pipe with you.  This app combines a pitch pipe and piano so that you have two of the quintessential tools of a singer!  The Keyboard allows for 6 octaves of pitches, ideal for vocal warm-ups or plunking out notes.  The Pitch Pipe is its primary function.  The Info page allows the user to provide feedback directly to the developer.  The goal is to make the best free mobile app for singers, so input is greatly appreciated.