Elektor Formant Modular

i wonder if its a common problem with the formant, or if its just mine..
if i modulate. say, the vca with a square lfo, i can actually HEAR the lfo, 
it doesnt only modulate, but you can also hear the "clicks" from the lfo 
(just af you put headphones to the lfo output), the same thing happens if i 
mod, the filter... there is no problem if i use the sine/triangle lfo... but 
when it comes to "steep" lfo waves.. i can hear a click....
hope someone can help


thanks
troels.

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