Schaeffer gave me permission to work in the studio with a technician, but I've never worked with him.

And I'll never forget the first time I took the possibility to project sound every day for six or seven hours with special devices which were built for me.

I spent most of the year in the studio for electronic music at a radio station in Cologne or in other studios where I produced new works with all kinds of electronic apparatus.

So there is a personal sense of style for a given work - I don't like a general style, but every work has its own style, and I want to create a style for every work.

Since I started composing I have always worked with series of tempos, even superimposed the music of different groups of musicians, of singers, instrumentalists who play and sing in different tempos simultaneously and then meet every now and then in the same tempo.

In particular what is most important to me is the transformation of a sound by slowing it down, sometimes extremely, so that the inner of sound becomes a conceivable rhythm.