The paper considers the frequency response of a feedback-system analogue in which the system is imitated by a discontinuous delay-line synthesizer.The various sources of error in the imitation transfer functions of the delay-line synthesizer and stabilizing network, as compared with the actual transfer functions of system and stabilizing network, are discussed. The contribution of each of these sources is calculated for a feedback system consisting of a multi-capacity process and a 3-term controller.The results of these calculations are used to determine how to minimize each of these contributions. Graphs are included from which the number of delay-line sections required for a prescribed accuracy and the best adaptation of the time scale of the process to that of the delay line may be determined.