Built it in 3 hours and can't stand to be away from it for more than a day. I stand about six inches behind the expression loop, with my left hand about four inches above the loop. My left hand and fingers and move freely to accomplish a wide variety of expressive effects. I hold my right hand about an inch over the box like a karate chop but with loose fingers, thumb up for balance, and knuckles pointing towards the pitch rod. One or more knuckles or fingers may reach towards or away from the rod to accomplish a small interval jumps, up to a fourth.
Vibrato is achieved by rotating the entire hand using the muscles of the forearm.
For the lowest register, I ball my hand and instead of rotating it, shake it towards and away from the rod. Recorded December 5, 2000.