Hi and welcome to Arturia forums.
when use other vst the sound is clean
To me this indicate it's not about the hardware fader.
Is it with certain presets and certain parameters you hear a noise? Can you please post the name of a Analog Lab factory preset and a name of the parameters in that preset that give a noise?
Do you get the noise everytime you change the same parameter?
Do you get the noise, when you change the parameter on Analog Lab's gui by using your computer mouse?
EDIT A screenshot of your Audio and midi settings in Analog Lab perhaps also could help. EDIT END