Various speed levels for Scale/Appregio workouts
It would be great to have multiple speed levels for scale and appregio workouts (up to lighning fast). For example there could be five (or six) speed levels and you have to unlock the next one be getting all Gold-stars on your current level.
Also add workouts for more scales (like harmonic minor and non-diatonic scales) and diminished appregios.
There's a speed bar on practice mode that you can use to adjust the speed.