Hey! Sorry I missed the page, Nick.. I was rehabbing my broken back and trying to escape from a prison that is located in a deep pit somewhere in the middle east.
Anyway, yeah, I've been using the Monotribe live for a little while, probably similar to what Jellica mentioned -- mostly improvising harmony parts and messing with the filters for an added live effect. I use a wav instrument that sends out a "cv click" to the Monotribe; in order to get a clean signal of just that instrument sound, I use a second Game Boy synched with the one that's playing the main song. The 2nd Game Boy just sends the click to the Monotribe (note that you have to use a Pro Sound output), which is hooked into the mixer going to the PA also... So the audience hears the main Game Boy and the Monotribe but not the click. Does that all make sense?
Here are a few examples:
http://www.youtube.com/watch?v=lMlvfwKkkFM
http://youtu.be/r3IA-9irC20 (the game boy and the monotribe are playing basically the same exact melody until I start layering stuff, etc.)
http://www.youtube.com/watch?v=8THXB91dSm0 (that one is kinda boring but it's basically all monotribe except for the sound of the game boy keeping time.. i basically use the monotribe to improvise an extended intro for the main song)