Using the "One MIDI Channel per Instrument" option in Caustic, in combination with a hardware midi Pad controller that allows assigning MiDI channels to each pad allows the ability to split the pads into multiple Caustic machines.
in this video I set up the bottom 8 pads to play Beatbox note numbers on MIDI Channel one, and Dminor(ish) scale on the top eight pads on MIDI channel two.
Caustic's ability to swap the order of machines makes it for a great way to "jam."
Edit: The purpose was to come up with a workflow for "live" improv/jamming with other people, I.e. An electronic drum circle of sorts.