Derek Holzer (1972) is an American sound artist living in Berlin, whose current interests include DIY analog electronics, sound art, field recording and the meeting points of electroacoustic, noise, improv and extreme music. Becoming frustrated with the performance limitations of the computer, he began new experiments with all-analog systems in 2006. These experiments resulted in electronic and graphical systems for playing light on the overhead projector in a performance called TONEWHEELS, which has been presented in Germany, the United Kingdom, Sweden, Norway, Poland, Estonia, Italy, Belgium and the Netherlands.

http://www.umatic.nl/tonewheels.html
http://www.myspace.com/macumbista
http://www.vimeo.com/macumbista