Grandmother filter & noise question

Hi all,

Could someone please help me clarify two things with my GM?

Filter: with env amount set to zero, turning the filter down only gets to around 200 on the dial before I hear nothing.

Noise: when Osc1&2 are set to 12 o clock and noise set full with filter wide open. Only then does the noise get close in volume to Oscillators. Turn up past 12 on Osc and noise is drowned out.

I have a feeling I have a dodgy noise generator but I’m hoping my filter is ok. Could anyone check and help me please?