It's an A/D hybrid delay (600msec) with analog modulation effect and self-oscillation capability. It has a very natural and clean sound with feedback that simulates tape delay units as the repeats decay in a very natural way. Your dry signal goes through the pedal in a totally analog way, remaining intact. The modulation effect is switched ON/OFF through a toggle switch and it is applied on the time-delay creating a ripple-effect. The modulation frequency is controlled through the "Hz" knob and a LED flashes in that frequency. Suitable both for clean & distorted signals.