Save the Tempo for each song in practice mode
The tempo should be saved for each song after the app is closed
I was going to make this suggestion but I see it has already been done. When you are working on a dozen different songs you can't remember which temp you left off at the last time you were working on it.
Laurens D'hooge commented
It would be really useful to let the app remember which tempo you mastered for the sections of a song in practice mode. This way you can pick up right where you left off, when coming back to a song the next time you play it.