Emax

I was wondering what the major differences are between the original 
Emax and the Emax II, aside from the Emax II being an upgraded
version 
of the Emax.  I ask because I already have an Emax II keyboard, and 
have the opportunity to purchase a rack mount Emax, and I'd like to 
know if picking up the Emax is worth my while, like if it possesses 
features the Emax II doesn't.