Playing multiple parts on a MIDI keyboard

There are a couple ways for a solo performer to play multiple electronic instruments at one time. The most straightforward way might be using two (or more) keyboards, either playing one with each hand simultaneously or quickly switching between them, maybe with the use of one or more sustain pedals. Yanni is really going for it here. Another option is "splitting," which is a feature on some MIDI keyboards that specifies a given key as a threshold between two parts. If you enable a split on your keyboard at C3, every key to the left of C3 is sent to synth 1, while C3 and above are sent to synth 2. This gives you control of two voices with one keybed, which is convenient in terms of space and arguably more comfortable, because you don't have to reach all over the place. But it is also limiting if you ever want those voices' pitches to overlap. Yesterday I learned about this "3 Zone" technique for solo piano. It seems to be a very old idea that this guy proceeded to coin, because I can't…