I just received delivery of a used PPF. I'm hoping someone (Donner?) can comment on the functioning of the Nature control. Most of the action occurs between 3:00 and 5:00 - significant attenuation of highs. Thru most of the control's travel - 9:00 to 3:00 - it doesn't perceptibly alter the tone. Between 7:00 and 9:00 it brings about what I'd describe as a subtle change in presence. I have a feeling all is not right with this one.
Any comments appreciated.