A few years back I did an experiment using the MD to send CV into my MS10, it kind of works but due to the outputs being AC coupled and the voltage level being around 4v P-P the results are a little strange, at the time I actually emailed Daniel at Elektron to see if a CV machine would be possible, but alas it is not. The way it works if you want to try, is the output level determines the voltage, so you can kind of change pitches, by using volume locks as well as pitch locks but it is nowhere like normal scaling. Nonetheless I found it quite interesting and a good source of serendipity
Here is the video with a bit of explanation.
http://www.youtube.com/watch?v=JOgMgSjXdsIEdit - Maybe a external scaling box could be built using an op amp as a scaled voltage follower.