for two hairdryers with rubber gloves and a feedback system involving a viola with transducer on the body and pickup on the bow created for the series zwielicht im farbfernsehen, berlin
two independent feedbacksystems running simulataneously and interfering with each other.
the first consists of an open microphone surrounded by two hairdryers with rubbergloves, blowing randomly. the microphone feeds into a filter controlled by an enevelope follower and sounding thru a loudspeaker.
the second feedbacksystem is a viola with a transducer attached to its body.
the microphone is a piezo disc on the tip of the bow, which also picks up vibrations from bowing on the strings.
neither system is insulated against the other.