EZ Voice funktioniert nicht

You can select up to 3 simultaneous audio effects of its 9 included high-quality effects: Use Tune to keep your voice in key like the pros; add Morph to try a different gender; apply Choir to add extra voices and harmonies; or try more traditional effects like Reverb, Delay, Chorus, EQ, Filter, and Level — all derived from IK Multimedia's award-winning professional audio software.  Just pick a song from your library and let EZ Voice do the rest — its intuitive controls make it easy to remove original vocals, tune your voice and add fun vocal effects.  EZ Voice is a companion app for iRig Voice and iRig MIC that lets you practice, perform and record vocals using the music in your mobile device’s music library.  EZ Voice does all the organizing for you, letting you compare, evaluate and modify your previously recorded takes with ease — you can even duplicate songs to take full-advantage of EZ Voice's many vocal effects.  Import a song, hit "No Voice" to remove the original vocals and then tap the record button — now it’s your turn in the spotlight.  Browse the built-in effects presets to let EZ Voice polish your voice for you, or unlock individual effects to unleash your creativity.  With EZ Voice, you’ll always stand out and deliver a winning performance.  It’s the easy way to sound great and sing along with your favorite music anytime, anywhere.  EZ Voice lets you have fun while you perfect your tone.  Share your favorite performances with your friends and fans.  Sing your heart out and record your performance with the REC interface.  Quickly manage your saved performances with the SONG menu.  You'll always deliver a pitch-perfect performance thanks to the FX menu.  Save your favorite combinations and settings to the preset library.  Now you can sing along with all of your favorite songs!  One tap adds an effect, two taps lets you edit.