Time to revive the old 2044 MIDIbox project: http://www.midibox.org/dokuwiki/doku.php?id=ssm2044_pcb
Hah I was talking about this yesterday oddly enough (with MBCV to use as an external filter).
I started in on this a while back. I have a post I started somewhere. The boards are built but I have not built the CV board yet to hook it up and test it out. The recommended caps are slightly different for the new chips. I think I have the details and schematics in my post. If I can find the time I would like to finish it up and test the caps and r values.