I just tried with the Paramount 450 and was able to adjust volume, tuning and brightness for individual notes; so I can't understand why you are experiencing this problem. I chose the Tibia 1, Gamba and Krumet ranks at random, but would expect others to behave the same way.
A potential puzzle with these organs is that there are tremmed and untremmed samples for nearly every rank - the Solo English Horn being a notable exception. If you try to adjust the wrong set of samples you won't hear any difference; however your problem seems to be that the sliders for individual notes don't behave normally. It might be worth uninstalling and reinstalling the organ - that can sometimes cure weird problems.