This is an old revision of the document!
Léo Maurel is a maker of a number instruments that are all built to produce sustained drones. this includes a number of experimental hurdy gurdies as well as compressed air controlled flutes, and some continuous bowing devices.
official website-
http://www.violonaroue.fr/Instruments
Official youtube channel-
https://www.youtube.com/user/leo17280/videos