As of right now, we do have an array of future updates that are planned into the mix that comes along with a more thorough high scoring system that conveniently and neatly covers all of the different keys and all of the different staff modes. The current high score system that stands, which just throws all scores from each staff mode into the same table, should be in effect for no more than the time of two more months from this post. There are ideas of improving the randomness of notes so that no note repeats itself until all have been repeated unless it was marked as incorrect. However, the current random shuffle system is very efficient and certainly will suffice until such an update has been achieved. The note repetition rate is not very high as it already is. Thanks and stay tuned for more news!