I too got my microbrute synced to a volca beats / monotribe via the CV LFO out (and Squarewave pattern, LFO synced to Sequencer), without any problems.
Then i bought the Minibrute SE, sold the microbrute and realized, that there is no CV-LFO-out on the MB SE.
So... i did a little circuitbending, soldering my own LFO-squarewave-out on the Minibrute SE (Hint by Leaf Cutter John called "megabrute") and its working very well... you even can use the SqW-LFO-out without Switching the Poti to Squarewave which means you can still use another waveform for soundtweaking.