'Plus-Minus'
a demonstrative acoustic audio art project

After having build some 76 musical robots, all acoustic in their sound generation but extensively controlled through both digital and analog electronics, the latest project is very different in nature. 'Plus-Minus' is an audio art installation allowing participants to explore the world of sum- and difference tones in a trully interactive way. The project consists of 18 analog ringmodulators (multiplier circuits) combined with 38 compressors. The output is through three large megaphone speakers. The input -and that's were the project really gets to become interactive- is a very large set of precisely tuned thick aluminum tubes, to be freely selected in pairs by the participants.

dr.Godfried-Willem Raes