Just make a simple sound with a filter on dirtyLP or so with resonance to self oscillation. Then hook LFO1 to the cutoff. Then check under LFO1 BIPOLAR and you'll see that it is properly bipolar. Only the display does not reflect it!
I don't mean to keep plugging my own creations, but my first synth "Cirque" (never released) has the exact same issue in the display and I was too lazy to add that, yet, myself, haha.
So, yeah...check out BIPOLAR on LFOs!

