The relative obscurity of the instrument would probably keep the number down, but as this is basically a key and wheel interface device it is probably ripe for a few people to give it a go and get the melody and drone sounds with some electronic effects thrown in. I was pleased to see some really interesting results.
First of all Bryan Tolley has some interesting examples along with some YouTube examples here and here. In this case Bryan has followed the 'electric guitar' route with a mixed electronic instrument along with effects.
I'm not sure how electronic the instrument is, but this is certainly using some electronic effects to interesting result below:
This is a hurdy-gurdy MIDI controller with the sound synthesis made via an accompanying iPad application. You can see it being played below. Neat, this looks very interesting. I like the styling and the wooden buttons.
Which returns us to where we began on finding this opto-electronic version or Vielle a Roue Optoelectronic which was commissioned for the very same festival in Pau that I saw the poster for...