Bandoneonbook by Hans W. Koch

Hans W. Koch performing Bandoneonbook for laptop
Hans W. Koch performs Bandoneonbook, using the acoustic feedback between the internal microphone and loudspeaker of the laptop.

In Bandoneonbook (2003) by Hans W. Koch the acoustic feedback between the small internal microphone and loudspeaker of a computer is played by opening and closing the laptop, similar to how one would play a bandoneon. The music software Max (at those times still called MaxMSP) is controlled by the keyboard of the laptop and by pressing some keys the feedback will be filtered in different ways. A piece which can only be performed with a titanium-powerbook series of 2001!