I wasn't able to listen to the audio unfortunately, but visually I instantly thought of a guitar equivalent of the Ondes Martenot: http://en.wikipedia.org/wiki

I wasn't able to listen to the audio unfortunately, but visually I instantly thought of a guitar equivalent of the Ondes Martenot: http://en.wikipedia.org/wiki/Ondes_Martenot http://en.wikipedia.org/wiki/Ondes_Martenot An instrument you've heard dozens of times. Also used by Varese, Messiaen and other 20th century composers