Hey, thanks so much for the response!  I'll be lookin further into the PC messages.  If / when you have a moment, could you explain a detail or two about how the units actually communicate?  I'm not sure how to let the Eventide's know what to do when the PC message comes thru.  

At this point, I'm using the MP201 to control a MURF (3 cv's) and a Ring Mod (the other cv).  I'd loooove to be able to turn the preset on the MP201 and have both my Eventide's change to the symbiotic preset of my choice.

Thanks again!