Pression by Helmut Lachenmann in a version for solo trombone

Mike Svoboda premiered a version of Helmut Lachenmann's groundbreaking work for solo cello (1969) at the Witten Festival for new chamber music in May, 2011. The work is the result of a collaboration starting in December 2009 seen first as an experiment: Can a composition still function when the form remains the same but the original sounds are substituted by similar sounds produced on a different instrument?