Control your voltage-controlled analog synth(s) from your audio interface

That's right, no MIDI-CV converter needed if you have a MOTU or other
audio interface with DC-coupled outputs - just use control voltage
straight from the audio interface:

http://createdigitalmusic.com/2009/01/16/analog-meet-digital-motu-volta-connects-the-mac-to-cv-synths-effects-graphically/#more-4785

Volta is an AU plugin. I'm sure some of you are smart enough to
figure out how to integrate it with your favorite microtuning software.