when I use the playback function the music selected doesn't play within the app. The music on my iPhone 6 is on Apple Music and I even tried downloading it onto the phone but that still didn't work. I wasn't sure if I was missing something..... Thanks for any help!
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I will post this as an answer, because this works, but it's a workaround.
What I do to practice with my library using a streaming service (I use Apple music) you simply play the music from your library using the Code like a bluetooth speaker. So after choosing a good tone, you just exit the app and go to your library.