1) figure out a setting that has better range, because hs only has two very limiting octaves
2) slip in some quick accidentals to make your hopscotchification sound more sophisticated
3) as stated above, sheet music sometimes does help, but not really if you don't have the right key and/or are working with a multi-line piece.
adding too many notes will make it lag extroardinarily, so it's often better to make the melody and add on bases according to how you'd like it to sound.
4) bpm converters are your oasis