SPEAKING IN TONGUES  video demonstrates the set of instruments. (see Fig. 1)

Fig. 1   Ultrasonic Instruments - video (2:31)

                                       

                       Fig. 2   Performance audio example - Composers Inside Electronics

                                  (John Driscoll, Phil Edelstein, Tom Hamilton)

                                  Experimental Intermedia Fdn (NYC)

For instrument description:  Speaking in Tongues (Ultra Desc)