 In their long history, and especially in its heyday as IBC, the studios manufactured much of their own equipment under the direction of Denis King.The quadraphonic mixing desk designed in the early 1970s was still in use in the late 1980s by Radiotracks, though in a different building.The desk had been built to take advantage of the quadraphonic technology that had been pioneered for music, though this never became popular and the desk was never used for that purpose in its music days.