1st version:

Spatial composition for 13 instrumental groups and 13 tapes arranged in 26 chambers of the Eggenberg Castle in Graz

Unlimited time

Manuscript and tapes by the composer

Premiere: October 12, 1974, Steirischer Herbst, Zamek Eggenberg, Graz

Pro Arte Ensemble

Order: Österreichischer Rundfunk, Graz

2nd version:

Spatial composition for 13 instrumental groups, 5 voices and 13 tapes distributed throughout the 13 chambers of the Rohan Palace in Strasbourg

Unlimited time

Manuscript and tape by the composer

PW: September 23, 1984, Musica Festival, Rohan Palace, Strasbourg

Order: Musica Festival, Strasbourg