Echos incoming MIDI notes for up to 16 steps, which are toggled by turning on each pad.
The first knob sets the beat division of the pads. The second multiplies the divisions. The third knob sets a decay or increase in the echo velocity per pad.
The last knob is a quick way of enabling pads starting from the first pad. TIP: Dial up a number of pads (echos) then disale a few to vary the echo rhythm.