LCD Noise reduction question

[Xenokai]

i have a 32" westy and it has a noise reduction option and its default to low but has Off,Low,Medium, and high when changing it to off from low or high i see no change at all. Does this feature only apply to the hd tuner channels because it doesnt seem to do anything.

[Ratman]

What does your manual state?

[Xenokai]

doesnt say much about it just says adjust the noise reduction setting

[Ratman]

Then, leave it off if you see no difference. ;)