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.
Yeah these are things I'm working on. The lack of dotted notes and rests are a weakness in doing any real songs which is why that section is a little lacking. I'm testing a new way to build lessons altogether which will be a big improvement over random. Anyway thanks for the feedback. I know there is a lot to go