Another choice made by the interpreter is not aligning any of the sides of the triangle vertically. If you took the piano roll and flipped each triangle 90 deg

Another choice made by the interpreter is not aligning any of the sides of the triangle vertically. If you took the piano roll and flipped each triangle 90 degrees to the right, you'd get regularly occurring note spam / lots of "chords" with several notes all half-steps away from each other, and it would sound very discordant.