Minibrute LFO and Filter issues

[MakR]

I purchased the Arturia Minibrute analog synth a while back in July; I just opened it to try it (plugged it in and put in headphones into the phonejack). The LFO seems to constantly modulate the filter cutoff frequency (even when all knobs on both the filter and LFO sections are turned to the left). As a result, I keep hearing sounds fade in and out; I'm not sure if the unit is defective or if there is something I'm doing wrong.

[Bruno@arturia]

Hi,
the LFO amount knobs are bipolar, that means that the "zero modulation" is center position not left. On left position modulation is maximum, but phase inverter compared to clockwise positions