mutant brain is a midi->cv converter - what you want is a cv->midi converter - there are not so many to choose from - befaco do a couple and addac - the doepfer one that I have has been discontinued and the current one is a single note and gate iirc
max/msp - are you using ableton? if so use I would have thought that using the cv tools in that and output to the es3 would be the simplest solution
"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia
Utility modules are the dull polish that makes the shiny modules actually shine!!!
sound sources < sound modifiers < modulation sources < utilities