In the works of Johannes Kretz a lot of attention is given to the shaping of timbre and harmony , to achieve a unification of them. Sounds are interpreted as chords, chords fused to let them appear as sounds.
Generating synthetic sound material with help of the computer has led to the folowing procedure:
Unterstanding of psychoacoustic effects and the ability of describing and formalizing ideas of art has helped to develop a new craftmanship in composition. This skills and techniques can also be found in Johannes Kretz' purely instrumental works.
So he succeeds in creating a strange - but wonderfully sturctured - world of sound, that invites the listener to find shapes in the area of timbre, which one was only used to find in the area of harmony before.
See also the following paper on KLANGPILOT.