I tried the app and I honestly am pretty disappointed. I know the app is for note training but the rhythms are completely broken. In Ode to Joy and Minuet, there are notes that should be dotted but are not. And in Practice modes there is also no consistency; some measures have 4 beats, others 6. I'd consider removing the measure bars entirely and/or making all notes have the same duration if note pitch is the only goal.