It does work, kind of, if you set the cut-off and the attack correctly through the GUI. But you should probably set the lfo waveform to 5, i.e,
kLFO lfo 4, kLFOFreq, 5
and replace that 4 with a 1. Then make sure that you give each of your controls a default value that makes sense. It makes little sense to have the attack at 0, as it will prevent any note from playing. So you should modify the range of that slider as the very least. I usually set the minimum and default to 0.001.