Reason as A MIDI to CV convertor

We've got a fair collection of synths here, some pre-dating MIDI, so connecting CV controlled devices to a modern setup is something we've dealt with before, (usually using the MIDI to CV capabilities of an old Novation BassStation we've got kicking around).....

The Volta plugin from MOTU allows you to use your audio interface as a MIDI to CV converter, and honestly is probably your best choice, but at around $200, is a touch pricey (and is currently unavailable for PC) unless you're going to be using it on a regular basis.
The guys at Peff.com have turned up with another solution - use the virtual CV patching in Reason's Thor. Check out the vid of it in action: