What's missing is the ability of the performer to go into the editing capabilities of their instrument and tweak and edit or create a custom kit, "EACH Individual drum part" in the kit they are using to make it sound the way it needs to be using all the tools, timber, resonance, key, dynamics, amplitude, release, cutoff, decay, attack, volume, course tune, fine tune, EQ, if they know how to do that, it's easily done on Roland, Korg, units, but not so much on Yamaha arrangers...