Listen to what you play on guitar as you're practicing the exercises
Play both ascending and descending interval questions in the same round
Dive into the results to see how you performed on each interval practiced
Get an even number of each of the selected intervals in the round's questions
Create a new round containing only the questions that you got wrong in your last try
Autosave the last session's settings, so that you can pick up were you left off with your previous configuration