Ages ago, I built a ribbon controller for driving my Korg Mono/Poly. Recently, I revived the ribbon and MIDI-fied it. Then, I brought back its CV capabilities and hooked it up to my Mono/Poly. It's so fun!
If you're interested, you can check it out (including demo) here:
http://synthhacker.blogspot.com/2016/04/diy-ribbon-controller-cv.html
Has anyone else built a ribbon before?
Chip