Recorded during a long weekend session at the laboratory of the Department of Electronics of Tampere University of Technology (TTKK) in August 1973. The whole work was done by using tape recorders, three signal generators, one digital noise generator, two microphones and a number of self made (analog) electronic circuits and different combinations of all these elements. All the ideas in these recordings, the producing, recording and mixing of the sound material, as well as the composition of the pieces were done by Matti Karjalainen and Unto Laine, in August and September 1973. Limited to 250 copies.