Lecture Feedback (Lfdbk 01-04) was composed for a lecture on acosutic feedback, which took place in March 1993. Source Feedback (Sfdbk 01-06) was composed as a soundtrack for the experimental video of the same name, which has been shown on different occasions in 1993. The original title of this work was "Spektren - Die Aesthetik Der Zensur" (Piano 01-03, Violin 01-03, Harpsichord 01-02)