The techniques initially used by the Radiophonic Workshop were closely related to those used in musique concrète; new sounds for programs were created by using recordings of everyday sounds such as voices, bells or gravel as raw material for "radiophonic" manipulations.
Much of the equipment used by the Workshop in the earlier years of its operation in the late 1950s was semi-professional and was passed down from other departments, though two giant professional tape-recorders (which appeared to lose all sound above 10 kHz) made an early centrepiece.