Klaus Filip is a performer/composer/programmer and is maybe the first viennese musician, who used the laptop on stage at around 1993. The main focus of his current work is sinewaves, whose subtle and adducent sounds are used in a wide dynamic range. As a sound artist he searches to cross sound and light. Klaus Filip runs a software project called ppooll(formerly known as lloopp) that is a networking collection of a variety of modules. This freeware is widely used by improvising musicians all over the world. Teaching position at the university of applied arts, vienna. Steady dispute with the computer as a musical instrument.