The otherworldly quality of Haack's music was emphasized by the instruments and recording techniques he developed with the Dance, Sing, and Listen series. Though he had little formal training in electronics, he made synthesizers and modulators out of any gadgets and surplus parts he could find, including guitar effects pedals and battery-operated transistor radios. Eschewing diagrams and plans, Haack improvised, creating instruments capable of 12-voice polyphony and random composition. Using these modular synthesizer systems, he then recorded with two two-track reel-to-reel decks, adding a moody tape echo to his already distinctive pieces.
