The CCIR,considering that the international exchange of monophonic and stereophonic reorded analogue sound programmes between broadcasting organizations may be made by means of magnetic recordings on tape, as stipulated in Recommendation 407; that measuring methods for the characteristics of magnetic tape analogue recordings and magnetic tape recording equipment are specified in EC Publication 94-3, Methods of measuring the characteristics of recording and reproducing equipment for sound on magnetic tape and in its Amendment No.1; that IEC Publication 94-2, Calibration tapes specifies the calibration tapes to be used for the measurements.