You're right... I had sync on, and switching it off removes it... I just do not get why that would make them click like that... there is certainly something going on when Sync is on with these FX types, but if they do not Tempo Sync, I don't get why they would click anyway...
but at least you can get the clicking away then... that's the most important thing, because it's useless with those clicks. I'm wondering if the clicks happen because the phase of the modulating LFO is reset abruptly at every note-on... that might explain it.