I believe it is possible: I checked on the very same thing a few years back. I own 2 488s and wanted to sync them together. I don't remember the name of the unit that did this, but I do remember that you'll have to sacrifice one track from each machine in order to sync them up. In the end you'll only have 14 tracks. The other kicker was the price on this little device: it was close to $500-600. This may be in correct but you might also have to get a sync-box. They're not that expensive (I payed $150). I think it was from MIDIMAN. I use it to sync up a midi track to keys and other miscellaneous MIDI gear. Good luck!