MOTM

A question for the list and maybe for the old crow...
Any thoughts about how to emulate a true CS80 using our MOTM modules? 
Filter 480 will be a must of course but, what else? I don't have in 
mind a full 8 voice (16 vcos) but the possibility of two or three 
voices at least would be necessary, I'm talking of CS80 but what I 
really have in mind is the incredible expressiveness of the Yamaha 
GX1 that is so strictly related to CS80... yet does anybody have 
enough information about the third monophonic keyboard on top of the 
GX1? I heard it has peculiar features not related to any other 
existing Yamaha synth. Sorry for the slight OT
Enrico Italy