The Zularic Repetitor is a trigger sequencer. It takes a clock signal and output different patterns of beats.
The Loquilic is an oscillator, just makes a fixed tone, so to get it to make pulses of sound it's plugged into the LXD through that mixer. The signal is being multed to the 2x channels of LxD so that two different drum sounds can be made from the same oscillator.
The LXD is a low pass gate acting on the oscillator, the top and bottom channels sound a little different, and it's being struck by the gates from the Zularic, this makes like a little drum sound each time the gate excites the LXD.