The DEL-4 is a high audio quality four channel delay module. It's so called "open system" and which means that all inputs, outputs and controllers can be coupled (routed) to external modules, such as modulators/modifiers and mixers for maximal flexibility. The DEL-4 consist of for identical delay lines. All delays can be controlled manually and by external signals (DELAY TIME CV) and by an external pulse signal (DELAY1-4 SYNC. The initial delay time is equal to the time of the positive half of the pulse/square wave).