One of the features of the MIDI Pokey synth is the ability to have one MIDI channel control all the Pokey voices polyphonically. That allows it to play chords directly from a standard MIDI keyboard without any fancy processing in between. The Pokey has four voices, so it can play four note chords. It can also do three note chords plus a melody line, and any other permutation of four. Making it work was just a matter of deciding how to route multiple notes to multiple channels.
More info and audio on the Blog. I want this one pretty bad..