Depths of Field is a series of compositions based on experiments in which not only separate sounds, but complete sound structures were generated by means of voltage-control techniques in the analogue studio (BEA5) at the Institute of Sonology. The title Depths of Field refers to a text by Gottfried Michael Koenig, in which he proposes the term “Field Composition” for a compositional strategy in which the techniques of “System Composition” (serial) and “Chance Composition” (aleatorics) are integrated.
Each Depths of Field piece is based on its own initial sound material, which directly or indirectly formed the input for further transformation processes. The results from these processes were organised into a family tree that was interpreted as a ‘form potential’, and as such gave suggestions for the large-form constructions.
For most production and transformation processes, the parameter values were selected from random curves, which were derived from the amplitudes of slowed-down noise sources and then stored on tape as control signals.
Depths of Field was commissioned by the Fonds voor de Scheppende Toonkunst.
Sonology’s voltage-controlled studio BEA 5 
family-tree diagram for D.O.F. no. 3
Depths of Field no. 1
year: 1996
duration: 14:30
tracks: 8
Depths of Field no. 2
year: 1996
duration: 4:40
tracks: 4
Depths of Field no. 3
year: 1997
duration: 19:20
tracks: 2
Depths of Field no. 4
year: 1997
duration: 5:00
tracks: 2
Depths of Field no. 3 is available on the CD Kees Tazelaar: Electronic Compositions (CV NEAR 13)