OK - test drive is done - time to pack up, and load the car!
I've decided that the Perform VG works the best in this scenario. I plug the HP out into the mic/instr IN on the KB, and send the trax from the DJ mixer to the aux in on the Harmonizer. If I bring the guitar, or banjo - there's a dedicated input for that, too. Putting my "roadie" hat on first ... then I hit the showers.