The Duotime has five different types of delay: Analog Delay, Tape Echo, Digital, Verb and MOD.
It's Analog Delay mode is inspired by the BOSS DM-2 bucket-brigade units and has a delay time of 40ms to 402ms. You can dial in a BBD-style infinite feedback by diming Level and Repeat and setting the Time knob to zero.
Adjust the Parameter knob for modulation depth. Otherwise, expect warm, darker repeats than you would on the Digital Delay.
With the Digital mode, you have 80ms to 1000ms of delay time to play on an effect inspired in part by Strymon and Neunaber units.