Formed in the late 1972 by Norbert Möslang and Andy Guhl, Voice Crack were initially a free jazz duo. They began incorporating pre-recorded tape effects and live processing, and by 1983 they eliminated any normal instrumentation in favor of what they call "cracked everyday electronics:" devices such as radios, clocks, portable video games, calculators and so on are opened, contact microphones or resonators are applied to the workings, and the resulting sounds are amplified and manipulated.