I just described here viewtopic.php?f=2&t=2204
how I synced two buzz instances. I even did it on a Mac - after installing windows on it
The only thing you'll need is a midi connection, either physical or digital. With rtpMidi
it should even be possible to sync two buzz instances over the internet, but I didn't test that.
My brother an me once used rtpMidi to change parameters: He played a midi keyboard in chile assigned to a generator in my buzz and I was sitting in germany and playing with cutoff and stuff, we had a funny time with that.